Tailscale with custom exit node

Hello. I have the flint router with Tailscale enabled with custom exit node. The exit node in selecting is in a different house. Once I turn on custom exit node I lose internet connection.

What is the firmware version of your router?

Hello the firmware is 4.4.6

Could you execute the following commands and PM me the result:

 tailscale status
 ip rule
 ip route show table 55
 ip route