here you are trying to get your capablilty from your backpack w/ no side(null)
here you check if there is no side(null)
so you never get the capablilty
use ifPresent instead of orElse
so .ifPresent(add the slots in here)
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after a bit of testing i found the problem
.orElse(new ItemStackHandler(36) < that is the problem
NEVER EVER do that.
you should never return a new object in .orElse