Here 4 networks. A VM from each network on both 2 compute nodes. This was OVS agent restart on network node (legacy deployment here). Tunnel 0x75b34 missing unicast flows. Tunnel 0x75b1d missing both.

BEFORE:
[root@123-1449 ~]# ovs-ofctl dump-flows br-tun
NXST_FLOW reply (xid=0x4):
 cookie=0x9f710356180d5375, duration=872.577s, table=0, n_packets=262, n_bytes=27320, idle_age=83, priority=1,in_port=1 actions=resubmit(,2)
 cookie=0x9f710356180d5375, duration=526.306s, table=0, n_packets=231, n_bytes=22502, idle_age=180, priority=1,in_port=7 actions=resubmit(,4)
 cookie=0x9f710356180d5375, duration=422.125s, table=0, n_packets=106, n_bytes=10221, idle_age=140, priority=1,in_port=8 actions=resubmit(,4)
 cookie=0x9f710356180d5375, duration=872.574s, table=0, n_packets=0, n_bytes=0, idle_age=65534, priority=0 actions=drop
 cookie=0x9f710356180d5375, duration=872.573s, table=2, n_packets=195, n_bytes=22750, idle_age=122, priority=0,dl_dst=00:00:00:00:00:00/01:00:00:00:00:00 actions=resubmit(,20)
 cookie=0x9f710356180d5375, duration=872.572s, table=2, n_packets=67, n_bytes=4570, idle_age=83, priority=0,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00 actions=resubmit(,22)
 cookie=0x9f710356180d5375, duration=872.569s, table=3, n_packets=0, n_bytes=0, idle_age=65534, priority=0 actions=drop
 cookie=0x9f710356180d5375, duration=863.798s, table=4, n_packets=27, n_bytes=4311, idle_age=197, priority=1,tun_id=0x75ae7 actions=mod_vlan_vid:2,resubmit(,10)
 cookie=0x9f710356180d5375, duration=861.078s, table=4, n_packets=202, n_bytes=18087, idle_age=140, priority=1,tun_id=0x75b10 actions=mod_vlan_vid:1,resubmit(,10)
 cookie=0x9f710356180d5375, duration=770.920s, table=4, n_packets=18, n_bytes=2874, idle_age=282, priority=1,tun_id=0x75b1d actions=mod_vlan_vid:4,resubmit(,10)
 cookie=0x9f710356180d5375, duration=756.222s, table=4, n_packets=90, n_bytes=7451, idle_age=346, priority=1,tun_id=0x75b34 actions=mod_vlan_vid:5,resubmit(,10)
 cookie=0x9f710356180d5375, duration=872.568s, table=4, n_packets=0, n_bytes=0, idle_age=65534, priority=0 actions=drop
 cookie=0x9f710356180d5375, duration=872.567s, table=6, n_packets=0, n_bytes=0, idle_age=65534, priority=0 actions=drop
 cookie=0x9f710356180d5375, duration=872.566s, table=10, n_packets=337, n_bytes=32723, idle_age=140, priority=1 actions=learn(table=20,hard_timeout=300,priority=1,cookie=0x9f710356180d5375,NXM_OF_VLAN_TCI[0..11],NXM_OF_ETH_DST[]=NXM_OF_ETH_SRC[],load:0->NXM_OF_VLAN_TCI[],load:NXM_NX_TUN_ID[]->NXM_NX_TUN_ID[],output:NXM_OF_IN_PORT[]),output:1
 cookie=0x9f710356180d5375, duration=526.301s, table=20, n_packets=31, n_bytes=3520, idle_age=458, priority=2,dl_vlan=5,dl_dst=fa:16:3e:5f:25:2e actions=strip_vlan,set_tunnel:0x75b34,output:7
 cookie=0x9f710356180d5375, duration=513.346s, table=20, n_packets=0, n_bytes=0, idle_age=513, priority=2,dl_vlan=4,dl_dst=fa:16:3e:51:92:0d actions=strip_vlan,set_tunnel:0x75b1d,output:7
 cookie=0x9f710356180d5375, duration=422.479s, table=20, n_packets=35, n_bytes=3964, idle_age=346, priority=2,dl_vlan=5,dl_dst=fa:16:3e:39:05:d8 actions=strip_vlan,set_tunnel:0x75b34,output:8
 cookie=0x9f710356180d5375, duration=422.125s, table=20, n_packets=0, n_bytes=0, idle_age=422, priority=2,dl_vlan=4,dl_dst=fa:16:3e:3c:23:5c actions=strip_vlan,set_tunnel:0x75b1d,output:8
 cookie=0x9f710356180d5375, duration=349.217s, table=20, n_packets=0, n_bytes=0, idle_age=349, priority=2,dl_vlan=2,dl_dst=fa:16:3e:7b:ff:22 actions=strip_vlan,set_tunnel:0x75ae7,output:7
 cookie=0x9f710356180d5375, duration=332.256s, table=20, n_packets=0, n_bytes=0, idle_age=332, priority=2,dl_vlan=2,dl_dst=fa:16:3e:6e:4a:1c actions=strip_vlan,set_tunnel:0x75ae7,output:8
 cookie=0x9f710356180d5375, duration=209.812s, table=20, n_packets=32, n_bytes=3596, idle_age=140, priority=2,dl_vlan=1,dl_dst=fa:16:3e:6a:0d:4e actions=strip_vlan,set_tunnel:0x75b10,output:8
 cookie=0x9f710356180d5375, duration=402.657s, table=20, n_packets=0, n_bytes=0, hard_timeout=300, idle_age=402, hard_age=282, priority=1,vlan_tci=0x0004/0x0fff,dl_dst=fa:16:3e:3c:23:5c actions=load:0->NXM_OF_VLAN_TCI[],load:0x75b1d->NXM_NX_TUN_ID[],output:8
 cookie=0x9f710356180d5375, duration=340.253s, table=20, n_packets=0, n_bytes=0, hard_timeout=300, idle_age=340, hard_age=220, priority=1,vlan_tci=0x0002/0x0fff,dl_dst=fa:16:3e:7b:ff:22 actions=load:0->NXM_OF_VLAN_TCI[],load:0x75ae7->NXM_NX_TUN_ID[],output:7
 cookie=0x9f710356180d5375, duration=317.172s, table=20, n_packets=0, n_bytes=0, hard_timeout=300, idle_age=317, hard_age=197, priority=1,vlan_tci=0x0002/0x0fff,dl_dst=fa:16:3e:6e:4a:1c actions=load:0->NXM_OF_VLAN_TCI[],load:0x75ae7->NXM_NX_TUN_ID[],output:8
 cookie=0x9f710356180d5375, duration=269.620s, table=20, n_packets=0, n_bytes=0, hard_timeout=300, idle_age=269, hard_age=225, priority=1,vlan_tci=0x0001/0x0fff,dl_dst=fa:16:3e:0f:e2:e8 actions=load:0->NXM_OF_VLAN_TCI[],load:0x75b10->NXM_NX_TUN_ID[],output:7
 cookie=0x9f710356180d5375, duration=207.135s, table=20, n_packets=0, n_bytes=0, hard_timeout=300, idle_age=207, hard_age=180, priority=1,vlan_tci=0x0001/0x0fff,dl_dst=fa:16:3e:c3:cf:4a actions=load:0->NXM_OF_VLAN_TCI[],load:0x75b10->NXM_NX_TUN_ID[],output:7
 cookie=0x9f710356180d5375, duration=193.248s, table=20, n_packets=0, n_bytes=0, hard_timeout=300, idle_age=193, hard_age=140, priority=1,vlan_tci=0x0001/0x0fff,dl_dst=fa:16:3e:6a:0d:4e actions=load:0->NXM_OF_VLAN_TCI[],load:0x75b10->NXM_NX_TUN_ID[],output:8
 cookie=0x9f710356180d5375, duration=872.565s, table=20, n_packets=3, n_bytes=180, idle_age=122, priority=0 actions=resubmit(,22)
 cookie=0x9f710356180d5375, duration=756.408s, table=22, n_packets=5, n_bytes=322, idle_age=463, hard_age=422, dl_vlan=5 actions=strip_vlan,set_tunnel:0x75b34,output:8,output:7
 cookie=0x9f710356180d5375, duration=771.139s, table=22, n_packets=3, n_bytes=210, idle_age=619, hard_age=421, dl_vlan=4 actions=strip_vlan,set_tunnel:0x75b1d,output:8,output:7
 cookie=0x9f710356180d5375, duration=484.677s, table=22, n_packets=0, n_bytes=0, idle_age=484, hard_age=332, dl_vlan=2 actions=strip_vlan,set_tunnel:0x75ae7,output:8,output:7
 cookie=0x9f710356180d5375, duration=19010.377s, table=22, n_packets=3, n_bytes=238, idle_age=12855, hard_age=209, dl_vlan=1 actions=strip_vlan,set_tunnel:0x75b10,output:8
 cookie=0x9f710356180d5375, duration=872.265s, table=22, n_packets=62, n_bytes=4218, idle_age=83, priority=0 actions=drop

[root@123-1449 ~]# ovs-ofctl show br-tun
OFPT_FEATURES_REPLY (xid=0x2): dpid:00005e7afeb83a44
n_tables:254, n_buffers:0
capabilities: FLOW_STATS TABLE_STATS PORT_STATS QUEUE_STATS ARP_MATCH_IP
actions: output enqueue set_vlan_vid set_vlan_pcp strip_vlan mod_dl_src mod_dl_dst mod_nw_src mod_nw_dst mod_nw_tos mod_tp_src mod_tp_dst
 1(patch-int): addr:26:22:99:40:48:d9
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 7(vxlan-c0a8ac04): addr:82:17:0e:7c:1f:57
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 8(vxlan-c0a8ac16): addr:f2:2d:67:92:ff:b5
     config:     0
     state:      0
     speed: 0 Mbps now, 0 Mbps max
 LOCAL(br-tun): addr:5e:7a:fe:b8:3a:44
     config:     PORT_DOWN
     state:      LINK_DOWN
     speed: 0 Mbps now, 0 Mbps max
OFPT_GET_CONFIG_REPLY (xid=0x4): frags=normal miss_send_len=0


AFTER:
[root@123-1449 ~]# ovs-ofctl dump-flows br-tun
NXST_FLOW reply (xid=0x4):
 cookie=0x95348cf176f5d259, duration=174.738s, table=0, n_packets=0, n_bytes=0, idle_age=306, priority=1,in_port=1 actions=resubmit(,2)
 cookie=0x95348cf176f5d259, duration=162.534s, table=0, n_packets=0, n_bytes=0, idle_age=403, priority=1,in_port=7 actions=resubmit(,4)
 cookie=0x95348cf176f5d259, duration=162.529s, table=0, n_packets=0, n_bytes=0, idle_age=364, priority=1,in_port=8 actions=resubmit(,4)
 cookie=0x95348cf176f5d259, duration=174.737s, table=0, n_packets=0, n_bytes=0, idle_age=65534, priority=0 actions=drop
 cookie=0x95348cf176f5d259, duration=174.734s, table=2, n_packets=0, n_bytes=0, idle_age=345, priority=0,dl_dst=00:00:00:00:00:00/01:00:00:00:00:00 actions=resubmit(,20)
 cookie=0x95348cf176f5d259, duration=174.733s, table=2, n_packets=0, n_bytes=0, idle_age=306, priority=0,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00 actions=resubmit(,22)
 cookie=0x95348cf176f5d259, duration=174.733s, table=3, n_packets=0, n_bytes=0, idle_age=65534, priority=0 actions=drop
 cookie=0x95348cf176f5d259, duration=166.026s, table=4, n_packets=0, n_bytes=0, idle_age=420, priority=1,tun_id=0x75ae7 actions=mod_vlan_vid:2,resubmit(,10)
 cookie=0x95348cf176f5d259, duration=165.020s, table=4, n_packets=0, n_bytes=0, idle_age=364, priority=1,tun_id=0x75b10 actions=mod_vlan_vid:1,resubmit(,10)
 cookie=0x95348cf176f5d259, duration=163.998s, table=4, n_packets=0, n_bytes=0, idle_age=505, priority=1,tun_id=0x75b1d actions=mod_vlan_vid:4,resubmit(,10)
 cookie=0x95348cf176f5d259, duration=160.074s, table=4, n_packets=0, n_bytes=0, idle_age=569, priority=1,tun_id=0x75b34 actions=mod_vlan_vid:5,resubmit(,10)
 cookie=0x95348cf176f5d259, duration=174.730s, table=4, n_packets=0, n_bytes=0, idle_age=65534, priority=0 actions=drop
 cookie=0x95348cf176f5d259, duration=174.727s, table=6, n_packets=0, n_bytes=0, idle_age=65534, priority=0 actions=drop
 cookie=0x95348cf176f5d259, duration=174.726s, table=10, n_packets=0, n_bytes=0, idle_age=364, priority=1 actions=learn(table=20,hard_timeout=300,priority=1,cookie=0x95348cf176f5d259,NXM_OF_VLAN_TCI[0..11],NXM_OF_ETH_DST[]=NXM_OF_ETH_SRC[],load:0->NXM_OF_VLAN_TCI[],load:NXM_NX_TUN_ID[]->NXM_NX_TUN_ID[],output:NXM_OF_IN_PORT[]),output:1
 cookie=0x95348cf176f5d259, duration=163.159s, table=20, n_packets=0, n_bytes=0, idle_age=572, priority=2,dl_vlan=2,dl_dst=fa:16:3e:7b:ff:22 actions=strip_vlan,set_tunnel:0x75ae7,output:7
 cookie=0x95348cf176f5d259, duration=163.155s, table=20, n_packets=0, n_bytes=0, idle_age=555, priority=2,dl_vlan=2,dl_dst=fa:16:3e:6e:4a:1c actions=strip_vlan,set_tunnel:0x75ae7,output:8
 cookie=0x95348cf176f5d259, duration=162.531s, table=20, n_packets=0, n_bytes=0, idle_age=162, priority=2,dl_vlan=1,dl_dst=fa:16:3e:4b:f6:ac actions=strip_vlan,set_tunnel:0x75b10,output:7
 cookie=0x95348cf176f5d259, duration=162.530s, table=20, n_packets=0, n_bytes=0, idle_age=162, priority=2,dl_vlan=1,dl_dst=fa:16:3e:c9:70:e5 actions=strip_vlan,set_tunnel:0x75b10,output:7
 cookie=0x95348cf176f5d259, duration=162.526s, table=20, n_packets=0, n_bytes=0, idle_age=364, priority=2,dl_vlan=1,dl_dst=fa:16:3e:6a:0d:4e actions=strip_vlan,set_tunnel:0x75b10,output:8
 cookie=0x95348cf176f5d259, duration=174.722s, table=20, n_packets=0, n_bytes=0, idle_age=345, priority=0 actions=resubmit(,22)
 cookie=0x95348cf176f5d259, duration=707.784s, table=22, n_packets=0, n_bytes=0, idle_age=707, hard_age=162, dl_vlan=2 actions=strip_vlan,set_tunnel:0x75ae7,output:8,output:7
 cookie=0x95348cf176f5d259, duration=19233.484s, table=22, n_packets=3, n_bytes=238, idle_age=13078, hard_age=162, dl_vlan=1 actions=strip_vlan,set_tunnel:0x75b10,output:8,output:7
 cookie=0x95348cf176f5d259, duration=979.515s, table=22, n_packets=5, n_bytes=322, idle_age=686, hard_age=160, dl_vlan=5 actions=strip_vlan,set_tunnel:0x75b34,output:7,output:8
 cookie=0x95348cf176f5d259, duration=174.455s, table=22, n_packets=0, n_bytes=0, idle_age=306, priority=0 actions=drop