Describe the bug
I'm currently trying to update from 1.20.4 to 1.21.1 and when doing so all the items in my barrels are gone as well as the barrels go from max space to basic space

To Reproduce
Put items into a barrel in 1.20.4 update the world to 1.21.1 and check inside

Hey Witchica was wondering if you had the chance to see this issue and if there’s anything that you may be able to do in order to fix it

Sorry for the delay in responding to this, rest assured I will be looking at this in the next few days.