Describe the bug
After Killing an enderman he droped a backpack with a diamond backpack inside and inside the diamond backpack there was diamond blocks in the filter upgrade slot upon klicking it it crashed the game

To Reproduce
not been able to reproduce

Crashlog
https://pastebin.com/5Uax6Pqb

In the latest version of sophisticated backpacks loot that gets generated in backpack will automatically exclude backpacks as that breaks a bit of balance given that they are put in backpack without inception upgrade and it also causes some of these super hard to fix issues. So this issue with latest version isn't possible