Odhcpd ipv6 wifi roaming

I have 3 wired wr941nd with 17.01.4 set with odhcpd ipv6 relay.
It works. But when wifi clients roam to another AP, routes on previous AP doesn't get deleted and cause problems in ipv6 connections.
Is there any way to delete the client ipv6 routes when it disconnects?
Or implement this feature on odhcpd?