https://imgur.com/a/URJFgFu
still connects properly and everything.

I would say optifine, a shader or mod is causing the rendering to break. Any steps to reproduce this?

There are no shaders involved shudders
The pack we're playing can be reproduced via Curse or MMC with this file.
https://cdn.discordapp.com/attachments/196812376127832065/702519079478624296/Some_Miner_Arcana-1.0.8.zip

apparently it was taking in items but not passing them along as well.

was this fixed with 126?