[MC-238063] If a falling block falls on another falling block, it destroys the second falling block

The bug:

So I was following a redstone tutorial on how to make a retractable wall from around 2012 when I discovered this bug. The wall worked fine originally, but at some point (at least a year ago, judging by the dates on the comments under the video complaining about how it didn't work anymore) a bug was introduced that made the wall not work anymore. As far as I can tell, when the top row of sand falls and hits the middle row in midair, one of the rows breaks (I think it's the middle one but it's hard to tell so it might actually be the top row)

How to reproduce:

Follow this tutorial, flick the lever to extend the wall, then flick it again to retract the wall (and thus trigger the bug)

Linked issues

duplicates 1

MC-207133 Some gravity blocks are destroyed & dropped as an item when attempting to occupy the same space as another gravity block Open

Comments 2

Mathemagician2 2021-10-04T22:27:44Z

After testing,

I found that this happens when the 1st set of falling blocks turn into solid blocks while the 2nd set (in entity form) is existing inside of them, causing the second set to turn into item form because they can't exist inside solid blocks.

Arisa Bot 2023-10-21T16:36:18Z

Thank you for your report!
We're tracking this issue in MC-207133, so this ticket is being resolved and linked as a duplicate.

If you would like to add a vote and any extra information to the main ticket it would be appreciated.

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