Minecraft: 1.12.2
Forge: 14.23.5.2847

Mods: 5
jei_1.12.2-4.15.0.291
mysticallib-1.12.2-1.7.0
mysticalworld-1.12.2-1.8.2
Patchouli-1.0-20
Roots-1.12.2-3.0.26

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GIF:
https://cdn.discordapp.com/attachments/377171551155650560/697297524796424394/rootspouchbug.gif

This occurs with any pouch.

Open it with either a key press or right-click and put in for example... 32 Sand Blocks, close it... and reopen it and store some more sand blocks on the same stack & close it. Now... when you reopen it... you'll noticed that your stacksize of Sand Blocks is still 32.

This also happens with any herb materials pouch in the other slots.

Hm. This ... means something isn't firing somewhere.

Oh, but the fix is in the unreleased 3.1 branch. So yeah, this should be fixed when 3.1 comes out.

Can confirm in 3.0.25 as well... Looks like shift clicking protects the stack, so that should be a usable workaround until the fix comes out.

Yeah, I'm going to aim to get a 3.1 release out soon even if I don't have the modifier overhaul/staff library change

@DoomRater is it resolved in 3.1 though?

Everything looks good in the 3.1 alpha6 build I have here.