Standing on the edge of a chest or copper chest will cause the player to fall through it

Note: This phenomenon occurs regardless of the game mode.

By seeing in the video you need to crouch to able to do this bug.

Hi!
Thank you for your report, however, this issue has been temporarily closed as Awaiting Response. 

• Could you please provide more details? As such we have no repro of this issue. 

• Were you using a controller or a keyboard with a mouse?

• Was auto jump enabled?

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Observed Results: 

(Briefly describe what happens) 

Expected Results: 

(Briefly describe what should happen) 

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Auto jump is off and is controlled by keyboard and mouse.

This may occur if you turn on Drop 3 2025.

Steps to Reproduce:

1. Rapidly place chests in any world.

2. Stand on the corner of the last-placed chest in any game mode.

3. If you're in Creative mode, turn off flight and crouch on a block's corner; you may sometimes sink into chests.

Since the bug can't be confirmed in the current version 1.21.100.24, it's possible it was due to world lag, a temporary bug, or a bug in 1.21.100.23 related to Drop 3 2025.