Steps to reproduce the bug:
1- Place a repeating command block near you with this command in it:
kill @e[type=minecraft:falling_block]
2- Set the command block to "Always active"
3- Place any gravity affected blocks (GAB) (sand, gravel, etc ...) in a case where the block is supposed to fall
4- The block won't fall until the command block is deactivated AND the GAB is updated
Demonstration video: https://youtu.be/k8AQ_MDccMY
The only command blocks used on this map are those shown in the video, and there are no custom datapacks loaded
Linked issues
duplicates
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Re: Dhranios
Sadly, it's a bit annoying when I'm using this behavior to, for example, fill a space with a specific block only when there is a support block.
For that particular case, I finally used carpets as they work as intended.

Thank you for your report!
We're tracking this issue in MC-56037, so this ticket is being resolved and linked as a duplicate.
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The cause for this is because the block actually doesn't delete itself, the falling block entity is supposed to do that on its first ticking (if they are the same block, or else it would delete itself, in order to prevent a duplication bug).