Minecraft Version

1.12.2

Forge Version

14.23.5.2838

Mod Version

1.12.2-0.11.3-366

Describe your problem, including steps to reproduce it

Freshly crafted omnihoppers/liquidhoppers do not properly stack with hoppers that have been placed and broken. They sometime appear to stack properly but it is just a desync causing them to get thrown when the inventory is closed

Any other comments?

They will stack fine with others after placing and breaking

Sounds like some NBT is getting written when the hopper is broken. Can you verify there's definitely nothing in the liquid hopper tanks, and no installed upgrades when the hopper is broken?

Yeah, just did a test with 2 new hoppers
Stacked fine
placed and broke one
bugged
placed and broke both(lost track of which was which)
stacking fine again

I installed the NBT Tooltip mod and using that I can't see any difference in the nbt using that but when I use the command /dumpNBT I get
New Hoppers

With older hoppers it returns No NBT

Yep, it's saving an empty upgrades inventory. Not sure where that crept in, but should be an easy fix.