Simple Copper Pipes 1.16.1 (Fabric 1.20.1) breaks Shulker projectiles (Frozen Lib issue)

[fleefie]

Yes, you read the title right. And yes, I'm as confused as you are reading this.

Shulker farms based on making a Shulker shoot through scaffolding are broken by this mod. Now, you may say, how do I know this ? Well, I was playing on a modified version of the official
Cobblemon pack for fabric with some friends, and the shulker farm by Ianxofour didn't work. I brought it to a singleplayer world, and it didn't work. I then hopped on vanilla, and it worked. I then hopped on unmodded fabric, and it worked. I tried the stock version of the Cobblemon pack, and it worked. I then checked every mod one by one, and it seemed to be the 1.16.1 version of this mod. Hopped on the unmodded fabric instance, added the mod, and now the shulker farm doesn't work.

TL:DR of the above paragraph : Yes, it's this mod specifically for some reason.

Above is a view of the kind of design that breaks. Essentially, the Shulker is meant to be forced to shoot above, going through the scaffolding. But when Simple Copper Pipes 1.16.1 is installed, it doesn't, and the bullet crashes on the scaffolding.

Link to the world with a version of the build if needed, and the associated showcase video

I'm willing to give more details as needed.

Modlist :

• Fabric Loader 0.15.3
• Fabric API 0.91.0
• Simple Copper Pipes 1.16.1

[fleefie]

Update : I've disabled Copper Pipes and added Frozen Lib instead. Seems that the issue comes from that and not Copper Pipes itself. Will forward this to their repo.

[fleefie]

For anyone seeing this in the future, you may simply open up the jar and delete the Jar for FrozenLib and replace it with version 1.6.1, editing the fabric.mod.json file to change the dependant version in the process. Doesn't seem to cause any breakage after personal testing, but don't take my word for it.

I'd edit the actual code and make a merge request, but I have strictly no Java-specific knowledge and it seems that old version of the mod aren't maintained anymore, so this will do for now