I am using the latest version of the mod for 1.14.4 (4.0.3), and I am having the issue of items not stacking properly.

Screenshots:

I should add that someone else had this issue and it only appeared after installing regeneration mod.

Yeah, we've been aware of this for a while, but we're not sure what causes the issue see #265
Could you do me a favour and upload your world somewhere and link it? I want to open a world with this in a NBT editor and investigate

Are you Suff on Discord? I don't really want to upload it here for everyone to see, I'd rather dm it since it's a world for yt that I don't really want people to have access to until the end.

I am indeed, add me as a friend and DM me

Issue is still present, will dm another copy of the world with the bugged items in my inventory soon. These are new items btw, not old ones.

Should be fixed now. Pre-existing items will act the same way. I think a possible solution to fixing these items is dropping them and then picking them up a few times.

If it's not fixed on any new items, please let me know.