When joining the server with 1.16.3 it shows a warning/error in the server's console:
[ViaVersion] Ignoring incoming plugin channel register of 'fabric-screen-handler-api-v1:open_screen', as it is longer than 32 characters

This shouldn't cause any issues since the server is likely vanilla-like and 1.8 and this is just a warning in the log. This should not affect gameplay.

This is caused by via version on the other side which is probably running on a 1.15.2 server.

I know paper has a system property that can lengthen that

@i509VCB 1.16.3. is not allowing channels that are longer than 32 chars or something like that. Server is on 1.8.

ViaVersion skips plugins channels longer than 32 because old spigot versions imposes that limit by kicking the player

@creeper123123321 is it safe?