Conditional Forwarding to Fritzbox doesn't work in v6

[Bucking_Horn]

SlothSquared, I've split your post into a separate topic, as your observation is different from OP, as your Conditional Forwarding line has a domain:

     revServers = [
       "true,10.0.0.0/24,10.0.0.1,domain.home"
     ] ### CHANGED, default = []

@SlothSquared

query[A] hass.domain.home from 10.0.0.39
forwarded hass.domain.home to 10.0.0.1
reply hass.domain.home is NXDOMAIN

What's the output of:

dig hass.domain.home @10.0.0.1