Issue: I can't trade with villagers on my modded Minecraft server. The only mod I have installed on the server is Legacy4J and Architectury API which are required to run the mod on CurseForge.

It seems like the first trade I make with a villager is the only trade I can continue to make with the villager, my friends have similar problems but it seems almost random when they can and can't trade with villagers, but as I have mentioned it has no issue with the first trade you make, just all trades after that

Note: I removed the mod and it now works fine so I am sure it is the mod that is the issue

Yeah there seems to be issues with this. For now if you switch to legacy menu when you go to trade and double click the trade you want it'll work.

Fixed in version 1.7, thanks for reporting.