I found the bug by accident when I was creating a map for a friend, I opened the barrel, although I mentally pressed the open inventory button, and then the barrel simply remained open. Quite an old bug, found it on versions 1.20, maybe lower

Link to video footage where I showed everything in detail: https://youtu.be/PB0LK9fFSaQ

How to make this bug?

1. You can place the barrel on a block and then you will have to catch timing and before open a barrel open an inventory