Hello!
I have been facing this weird situation and I am not sure if our server is missing a config.
On a friend's server, I can place fishtraps and they seem to gather stuff (when I break them, fished items are dropped) but I cannot right-click them. (for the record, I checked and my "use" hotkey is set to right click and I can access everything else correctly)
I also can access the UI of other Growthcraft items, for example the Fermentation Barel.

What is bugging me, is that on a home world, using the exact same forge and mod files, I can access them as well. The server owner has the same problem with me.

Are we missing a config and/or setting?

Minecraft version:
1.12.2
Forge version:
1.12.2-14.23.5.2825

Sounds like a Sided issue.

I can't even get the source code to compile without major refactoring. I can keep this issue open in case others experience it, but I have to be real, there's not much time available for fixing the build to push out updates.

Thanks for the reply! I understand that this version is a bit old. Is there any version of the mod for 1.12.2 that you would recommend?