1. Open VRChat and join instance.
  2. Having unstable connection, might be ISP issue.
  3. Connect to VPN in the middle of session, Then click rejoin the world.
  4. A popup said "World is incompatible with current platform" Even you tried to go home or other instance, It'll place you at error world.
This used to work before, around 2-3 month ago with a behavior of getting kicked out that said "Time out" (Make sense) but it reconnects using VPN network afterwords.