As described in the release note[1] mixing tunneled(geneve,vxlan etc) and non tunneled(flat/vlan) on the same router with gateway port attached, "redirect-type=bridged" can not be used and that makes non tunneled network traffic to be centralized(not tunneled) as reside-on-redirect-chassis=true is set. If non tunneled(vlan/flat) network traffic needs to be distributed then separate router has to be used.

If the router do no have external gateway attached(i.e no distributed router gateway port) then both redirect-type and reside-on-redirect-chassis configs are ignored and all chassis hosting distributed router port(all chassis where this router port is active i.e chassis where atleast 1 vm exists connected to the logical switch) will respond to arp requests for the router port. This can lead to random behavior from the switch perspective as it will see ARP replies from multiple port. This switch behavior also applies when only vlan networks attached to the router.

[1] https://review.opendev.org/c/openstack/neutron/+/879295/1/releasenotes/notes/redirect-type-f29e89ca97357fe9.yaml