[Minecraft Transit Railway] mod allows you to create a full-fledged public transport system, where routes are configured using a special menu that should look like this...

But the map on the right is not displayed when using the mod in conjunction with owo-lib, which makes it impossible to do anything with transport system.

Fabric 1.20.1 with API 0.87.0
owo-lib 0.11.1
MTR 3.2.2 hotfix 1

The problem was not in owo-lib itself, the bug appears with the Things mod

This problem was indeed in owo-lib, but another mod (like Lavender, which is included in Things) was required to trigger it. Either way, it is now fixed in 0.11.2

Cheers