I had a similar issue migrating from the Wireguard client to the Wiresock client where I couldn’t access my local network with the same Allowed IPs 0.0.0.0/1, 128.0.0.0/1, ::/1, 8000::/1.
To get it t work with Wiresock I had to add Disallowed IPs 172.16.0.0/24 . Perhaps this is because my LAN has an odd IP range.
I don’t really understand the Allowed IPs because they say allow an address with the top bit set or with the top bit clear. I.e. allow all addresses. This seems to be a special marker to mean all but the LAN addresses. Most LANs are 192.168.1.xx but mine isn’t.