SynchThingy with BasicSync sync fail

Why does SynchThingy v0.8.3 (on Bazzite OS) does not connects to (Pixel 9 with Graphene OS running BasicSync) can't see each other (status disconnected)? Remote devices added, keys match. Everything worked properly around 2 weeks ago, no changes done.

Tried without VPN, local discovery only, etc.