Brian, 

Many thanks for your response. Here's the information you requested:

neutron-dhcp-agent stack trace: 

2023-02-16 19:11:47.896 49507 ERROR neutron.agent.dhcp.agent [-] Unable to enable dhcp for aee895a8-acda-420c-9c58-6a936c9a4102.: neutron.privileged.agent.linux.ip_lib.InvalidArgument: Invalid parameter/value used on interface ns-beed7d37-b4, namespace qdhcp-aee895a8-acda-420c-9c58-6a936c9a4102.
2023-02-16 19:11:47.896 49507 ERROR neutron.agent.dhcp.agent Traceback (most recent call last):
2023-02-16 19:11:47.896 49507 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python3/dist-packages/neutron/agent/dhcp/agent.py", line 227, in call_driver
2023-02-16 19:11:47.896 49507 ERROR neutron.agent.dhcp.agent     rv = getattr(driver, action)(**action_kwargs)
2023-02-16 19:11:47.896 49507 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python3/dist-packages/neutron/agent/linux/dhcp.py", line 266, in enable
2023-02-16 19:11:47.896 49507 ERROR neutron.agent.dhcp.agent     common_utils.wait_until_true(self._enable, timeout=300)
2023-02-16 19:11:47.896 49507 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python3/dist-packages/neutron/common/utils.py", line 708, in wait_until_true
2023-02-16 19:11:47.896 49507 ERROR neutron.agent.dhcp.agent     while not predicate():
2023-02-16 19:11:47.896 49507 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python3/dist-packages/neutron/agent/linux/dhcp.py", line 278, in _enable
2023-02-16 19:11:47.896 49507 ERROR neutron.agent.dhcp.agent     interface_name = self.device_manager.setup(self.network)
2023-02-16 19:11:47.896 49507 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python3/dist-packages/neutron/agent/linux/dhcp.py", line 1770, in setup
2023-02-16 19:11:47.896 49507 ERROR neutron.agent.dhcp.agent     self.driver.init_l3(interface_name, ip_cidrs,
2023-02-16 19:11:47.896 49507 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python3/dist-packages/neutron/agent/linux/interface.py", line 153, in init_l3
2023-02-16 19:11:47.896 49507 ERROR neutron.agent.dhcp.agent     device.addr.add(ip_cidr)
2023-02-16 19:11:47.896 49507 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python3/dist-packages/neutron/agent/linux/ip_lib.py", line 536, in add
2023-02-16 19:11:47.896 49507 ERROR neutron.agent.dhcp.agent     add_ip_address(cidr, self.name, self._parent.namespace, scope,
2023-02-16 19:11:47.896 49507 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python3/dist-packages/neutron/agent/linux/ip_lib.py", line 821, in add_ip_address
2023-02-16 19:11:47.896 49507 ERROR neutron.agent.dhcp.agent     privileged.add_ip_address(
2023-02-16 19:11:47.896 49507 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python3/dist-packages/oslo_privsep/priv_context.py", line 247, in _wrap
2023-02-16 19:11:47.896 49507 ERROR neutron.agent.dhcp.agent     return self.channel.remote_call(name, args, kwargs)
2023-02-16 19:11:47.896 49507 ERROR neutron.agent.dhcp.agent   File "/usr/lib/python3/dist-packages/oslo_privsep/daemon.py", line 224, in remote_call
2023-02-16 19:11:47.896 49507 ERROR neutron.agent.dhcp.agent     raise exc_type(*result[2])
2023-02-16 19:11:47.896 49507 ERROR neutron.agent.dhcp.agent neutron.privileged.agent.linux.ip_lib.InvalidArgument: Invalid parameter/value used on interface ns-beed7d37-b4, namespace qdhcp-aee895a8-acda-420c-9c58-6a936c9a4102.
2023-02-16 19:11:47.896 49507 ERROR neutron.agent.dhcp.agent
2023-02-16 19:11:47.897 49507 INFO neutron.agent.dhcp.agent [-] Finished network aee895a8-acda-420c-9c58-6a936c9a4102 dhcp configuration
2023-02-16 19:11:47.897 49507 INFO neutron.agent.dhcp.agent [req-50988b6b-7d62-40e8-bceb-8cb9d0f5fbdc - - - - -] Synchronizing state complete
2023-02-16 19:11:47.901 49507 INFO neutron.agent.dhcp.agent [req-50988b6b-7d62-40e8-bceb-8cb9d0f5fbdc - - - - -] Synchronizing state

Network and subnet info:

+---------------------------+--------------------------------------+
| Field                     | Value                                |
+---------------------------+--------------------------------------+
| admin_state_up            | UP                                   |
| availability_zone_hints   |                                      |
| availability_zones        | openstack-network                    |
| created_at                | 2023-02-16T19:11:19Z                 |
| description               |                                      |
| dns_domain                | None                                 |
| id                        | aee895a8-acda-420c-9c58-6a936c9a4102 |
| ipv4_address_scope        | None                                 |
| ipv6_address_scope        | None                                 |
| is_default                | None                                 |
| is_vlan_transparent       | None                                 |
| mtu                       | 1279                                 |
| name                      | zakhar-test-1279                     |
| port_security_enabled     | True                                 |
| project_id                | cfbad741bc0840f5b5db6fbc691d61f0     |
| provider:network_type     | vxlan                                |
| provider:physical_network | None                                 |
| provider:segmentation_id  | 4224                                 |
| qos_policy_id             | None                                 |
| revision_number           | 2                                    |
| router:external           | Internal                             |
| segments                  | None                                 |
| shared                    | False                                |
| status                    | ACTIVE                               |
| subnets                   | dd919723-f118-49c3-a1af-3c8d12ea2330 |
| tags                      |                                      |
| updated_at                | 2023-02-16T19:11:19Z                 |
+---------------------------+--------------------------------------+

+----------------------+--------------------------------------+
| Field                | Value                                |
+----------------------+--------------------------------------+
| allocation_pools     | 10.10.10.2-10.10.10.254              |
| cidr                 | 10.10.10.0/24                        |
| created_at           | 2023-02-16T19:11:19Z                 |
| description          |                                      |
| dns_nameservers      |                                      |
| dns_publish_fixed_ip | None                                 |
| enable_dhcp          | True                                 |
| gateway_ip           | 10.10.10.1                           |
| host_routes          |                                      |
| id                   | dd919723-f118-49c3-a1af-3c8d12ea2330 |
| ip_version           | 4                                    |
| ipv6_address_mode    | None                                 |
| ipv6_ra_mode         | None                                 |
| name                 | sub-1279-dhcp                        |
| network_id           | aee895a8-acda-420c-9c58-6a936c9a4102 |
| prefix_length        | None                                 |
| project_id           | cfbad741bc0840f5b5db6fbc691d61f0     |
| revision_number      | 0                                    |
| segment_id           | None                                 |
| service_types        |                                      |
| subnetpool_id        | None                                 |
| tags                 |                                      |
| updated_at           | 2023-02-16T19:11:19Z                 |
+----------------------+--------------------------------------+

I also noticed that during the interface creation neutron-linuxbridge-agent fails to disable IPv6 for this network's interface because the interface doesn't have IPv6 due to low MTU. Unlike neutron-dhcp-agent, neutron-linuxbridge-agent doesn't stop functioning after this:

2023-02-16 19:11:22.397 6780 INFO neutron.agent.securitygroups_rpc [req-9e33893e-4797-4714-a4c6-dc870ef9ae87 - - - - -] Preparing filters for devices {'tapbeed7d37-b4'}
2023-02-16 19:11:22.772 6780 INFO neutron.plugins.ml2.drivers.agent._common_agent [req-9e33893e-4797-4714-a4c6-dc870ef9ae87 - - - - -] Port tapbeed7d37-b4 updated. Details: {'device': 'tapbeed7d37-b4', 'network_id': 'aee895a8-acda-420c-9c58-6a936c9a4102', 'port_id': 'beed7d37-b486-476f-b79a-60640b04907e', 'mac_address': 'fa:16:3e:f0:19:1c', 'admin_state_up': True, 'network_type': 'vxlan', 'segmentation_id': 4224, 'physical_network': None, 'mtu': 1279, 'fixed_ips': [{'subnet_id': 'dd919723-f118-49c3-a1af-3c8d12ea2330', 'ip_address': '10.10.10.4'}], 'device_owner': 'network:dhcp', 'allowed_address_pairs': [], 'port_security_enabled': False, 'qos_policy_id': None, 'network_qos_policy_id': None, 'profile': {}, 'propagate_uplink_status': False}
2023-02-16 19:11:22.789 6780 INFO neutron.plugins.ml2.drivers.linuxbridge.agent.arp_protect [req-9e33893e-4797-4714-a4c6-dc870ef9ae87 - - - - -] Skipping ARP spoofing rules for port 'tapbeed7d37-b4' because it has port security disabled
2023-02-16 19:11:22.827 6780 ERROR neutron.agent.linux.utils [req-9e33893e-4797-4714-a4c6-dc870ef9ae87 - - - - -] Exit code: 255; Cmd: ['sysctl', '-w', 'net.ipv6.conf.vxlan-4224.disable_ipv6=1']; Stdin: ; Stdout: ; Stderr: sysctl: cannot stat /proc/sys/net/ipv6/conf/vxlan-4224/disable_ipv6: No such file or directory
2023-02-16 19:11:22.828 6780 WARNING neutron.agent.linux.ip_lib [req-9e33893e-4797-4714-a4c6-dc870ef9ae87 - - - - -] Setting ['sysctl', '-w', 'net.ipv6.conf.vxlan-4224.disable_ipv6=1'] in namespace None failed: Exit code: 255; Cmd: ['sysctl', '-w', 'net.ipv6.conf.vxlan-4224.disable_ipv6=1']; Stdin: ; Stdout: ; Stderr: sysctl: cannot stat /proc/sys/net/ipv6/conf/vxlan-4224/disable_ipv6: No such file or directory
.: neutron_lib.exceptions.ProcessExecutionError: Exit code: 255; Cmd: ['sysctl', '-w', 'net.ipv6.conf.vxlan-4224.disable_ipv6=1']; Stdin: ; Stdout: ; Stderr: sysctl: cannot stat /proc/sys/net/ipv6/conf/vxlan-4224/disable_ipv6: No such file or directory

Pastebin of the above: https://pastebin.com/2LFVktiX 

I hope this helps.