Describe the bug
Original report: EnigmaticaModpacks/Enigmatica9#693
If a backpack has stack upgrades in it and is storing unstackable items (potions), it will allow the extraction of more than 1 item as a stack. In this case, Thermal Pulverizers are able to extract a full stack of 64 potions from the backpack

To Reproduce
Steps to reproduce the behavior:

1. Place backpack in world
2. insert stack upgrades
3. put a bunch of Lingering Regen II potions in there
4. set a thermal pulverizer to extract the potions so it can process them. It will grab them in alternating stacks of 64 and 1

Note, you'll obviously need custom recipes for this as these aren't default. For simplicity, you can see the issue in Enigmatica 9 Expert

Expected behavior
Items that are otherwise unstackable should not be allowed to be extracted at greater stacks than 1

Screenshots
See above

Versions
sophisticatedbackpacks-1.19.2-3.19.1.960

This is fixed in the latest release on curseforge.