As an admin for the Cursed Walking modpack, I was recently sent this message.

"(regarding CW test server) Hey, so i discovered recently that you can stack unstackable items. (eg such as stacking lava buckets to 64, stack eggs to 64, stack tools and armour and so on). To recreate to bug, you put the items you want to stack into an item shop, and then withdrawl. The item shop will then eject all the items onto the ground as stacked. 🙂" [sic]

Testing of my own confirms this, see the attached screenshot.

I'd hazard this is an issue with the class associated with your "removeitems" event, whatever you've called it. This issue doesn't lead to any major exploit with our pack, I believe, but it would be nice to see a fix for it.

Thanks for your time, I do understand this isn't a big issue so take your time.

Was just sent this as well:

"I immediately got a few ideas of how it might be possible to dupe using this method (like depositing items into a stack of backbacks) but wasnt able to get it to work. So thats good at least xD" [sic]

Sorry, misclick