I just found out, that putting a tamed cat on top of a chest and making it sit, makes the chest and connected double chests inaccessible.
I doubt, that this is intentional game design.
Reproducable in 20w49a:
1. Make new world
2. Place Chest
3. spawn cat, tame it and make it sit
4. Chest locked
Linked issues
Comments 4
From the Minecraft wiki:
A cat not already sitting attempts to get on top of chests, the foot part of beds, or active furnaces at the cat's current Y-level within a 4-block-radius square
horizontally, and once on top often assumes a sitting position without a command from the player. A cat also occasionally attempts to sit on
these blocks if the blocks are at ground level. A chest with a cat sitting on top of it becomes unusable unless the cat is commanded to stand.
Thank you for your report!
We're tracking this issue in MC-96299, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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Addition: Tamed Wolves and tamed parrots seem to not lock the chest, so this might have to do with cats alone