Just an update -- I was able to replicate this using neutron-openvswitch-agent 11.0.0.0rc2.dev368.

Server:

root@osa-master-ovs:/home/ubuntu# tcpdump -i tap849fa737-65 -ne port 80
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on tap849fa737-65, link-type EN10MB (Ethernet), capture size 262144 bytes
04:29:21.667498 fa:16:3e:32:40:3d > fa:16:3e:f3:2c:61, ethertype IPv4 (0x0800), length 74: 192.168.1.2.42444 > 192.168.1.3.80: Flags [S], seq 364460666, win 29200, options [mss 1460,sackOK,TS val 2559349669 ecr 0,nop,wscale 7], length 0
04:29:21.668573 fa:16:3e:f3:2c:61 > fa:16:3e:32:40:3d, ethertype IPv4 (0x0800), length 74: 192.168.1.3.80 > 192.168.1.2.42444: Flags [S.], seq 4137876027, ack 364460667, win 14480, options [mss 1460,sackOK,TS val 4294931608 ecr 2559349669,nop,wscale 4], length 0
04:29:21.669023 fa:16:3e:32:40:3d > fa:16:3e:f3:2c:61, ethertype IPv4 (0x0800), length 66: 192.168.1.2.42444 > 192.168.1.3.80: Flags [.], ack 1, win 229, options [nop,nop,TS val 2559349670 ecr 4294931608], length 0
04:29:21.669077 fa:16:3e:32:40:3d > fa:16:3e:f3:2c:61, ethertype IPv4 (0x0800), length 141: 192.168.1.2.42444 > 192.168.1.3.80: Flags [P.], seq 1:76, ack 1, win 229, options [nop,nop,TS val 2559349670 ecr 4294931608], length 75: HTTP: GET / HTTP/1.1
04:29:21.669979 fa:16:3e:f3:2c:61 > fa:16:3e:32:40:3d, ethertype IPv4 (0x0800), length 66: 192.168.1.3.80 > 192.168.1.2.42444: Flags [.], ack 76, win 905, options [nop,nop,TS val 4294931609 ecr 2559349670], length 0
04:29:21.672658 fa:16:3e:f3:2c:61 > fa:16:3e:32:40:3d, ethertype IPv4 (0x0800), length 90: 192.168.1.3.80 > 192.168.1.2.42444: Flags [P.], seq 1:25, ack 76, win 905, options [nop,nop,TS val 4294931610 ecr 2559349670], length 24: HTTP
04:29:21.672710 fa:16:3e:32:40:3d > fa:16:3e:f3:2c:61, ethertype IPv4 (0x0800), length 66: 192.168.1.2.42444 > 192.168.1.3.80: Flags [.], ack 25, win 229, options [nop,nop,TS val 2559349671 ecr 4294931610], length 0
04:29:55.543336 fa:16:3e:f3:2c:61 > fa:16:3e:32:40:3d, ethertype IPv4 (0x0800), length 66: 192.168.1.3.80 > 192.168.1.2.42444: Flags [F.], seq 25, ack 76, win 905, options [nop,nop,TS val 4294940076 ecr 2559349671], length 0
04:29:55.579959 fa:16:3e:32:40:3d > fa:16:3e:f3:2c:61, ethertype IPv4 (0x0800), length 66: 192.168.1.2.42444 > 192.168.1.3.80: Flags [F.], seq 76, ack 26, win 229, options [nop,nop,TS val 2559358148 ecr 4294940076], length 0
04:29:55.580711 fa:16:3e:f3:2c:61 > fa:16:3e:32:40:3d, ethertype IPv4 (0x0800), length 66: 192.168.1.3.80 > 192.168.1.2.42444: Flags [.], ack 77, win 905, options [nop,nop,TS val 4294940087 ecr 2559358148], length 0
^C
10 packets captured
10 packets received by filter
0 packets dropped by kernel

Bystander:

root@osa-master-ovs:/home/ubuntu# tcpdump -i tap2bceb97c-0b -ne port 80
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on tap2bceb97c-0b, link-type EN10MB (Ethernet), capture size 262144 bytes
04:29:21.668768 fa:16:3e:f3:2c:61 > fa:16:3e:32:40:3d, ethertype IPv4 (0x0800), length 74: 192.168.1.3.80 > 192.168.1.2.42444: Flags [S.], seq 4137876027, ack 364460667, win 14480, options [mss 1460,sackOK,TS val 4294931608 ecr 2559349669,nop,wscale 4], length 0
04:29:21.669993 fa:16:3e:f3:2c:61 > fa:16:3e:32:40:3d, ethertype IPv4 (0x0800), length 66: 192.168.1.3.80 > 192.168.1.2.42444: Flags [.], ack 76, win 905, options [nop,nop,TS val 4294931609 ecr 2559349670], length 0
04:29:21.672677 fa:16:3e:f3:2c:61 > fa:16:3e:32:40:3d, ethertype IPv4 (0x0800), length 90: 192.168.1.3.80 > 192.168.1.2.42444: Flags [P.], seq 1:25, ack 76, win 905, options [nop,nop,TS val 4294931610 ecr 2559349670], length 24: HTTP
04:29:55.544026 fa:16:3e:f3:2c:61 > fa:16:3e:32:40:3d, ethertype IPv4 (0x0800), length 66: 192.168.1.3.80 > 192.168.1.2.42444: Flags [F.], seq 25, ack 76, win 905, options [nop,nop,TS val 4294940076 ecr 2559349671], length 0
04:29:55.580729 fa:16:3e:f3:2c:61 > fa:16:3e:32:40:3d, ethertype IPv4 (0x0800), length 66: 192.168.1.3.80 > 192.168.1.2.42444: Flags [.], ack 77, win 905, options [nop,nop,TS val 4294940087 ecr 2559358148], length 0
^C
5 packets captured
5 packets received by filter
0 packets dropped by kernel