I've been playing a modpack on 1.14 for about a week now and from the very beginning, I have been having issues where any item in the game that had been obtained differently from another of the same type, wouldn't stick. For example, torches that'd been crafted wouldn't stack with torches that had been broken and recollected.

I know it was this mod as after I had narrowed it down via the standard 50/50 method, I disabled every other mod in the pack and tried crafting then placing and breaking torches and the issue persisted, yet did not without this mod.

I'm unable to provide a log, as I'm not sure which one was the latest prior to my disabling this mod in the pack.

Stale and unsupported version now :(

I won't need a log for this, but I will need a world save, even a fresh one where you can make a chest of affected items and put them in a chest
This way I can look at their NBT data and see what the issue is

Regen Stacking Issue.zip

Here's the zipped world save. I created this using a manually updated version of the Tardis Engineers pack. I have added 3 chests, 1 for vanilla items, 1 for regeneration mod items, and one for other modded items from the pack. All are affected by the issue.

The chests are labeled accordingly, and inside the chests, I've used renamed paper to signal which blocks have been crafted and which have been placed and broken again as this is the easiest way to demonstrate the issue.

Sorry for the late reply to this, I've had a rather busy week.

Also, if I don't see replies on here. Feel free to dm me on discord, I'm angel bob from the tardis mod server. Assuming you would be He Who Suffs.

Dev Notes:
After looking into the NBT of an infected item and a uninfected item, there is a difference
The infected items appear to have a empty additional tag, making the two itemstacks different, and therefore unstackable
The reason why this tag appeats is currently unknown, but will be looked into