Sand/gravel breaks even when dropping very few and randomly/inconsistently

Partner Rank:

3

Partner Team Reporting:

Jigarbov Productions Inc.

Verification builds and Platforms:

1.12.1.1
1.14.0.3 Minecraft - Publish_3240615 Win10

Summary:

Sand/gravel breaks itself randomly and inconsistently when dropping.

Impact:

Blocks not acting consistently is a problem, especially when coupled with bug MCM-859, the player could get erroneous items in their inventory causing for a bad player experience in adventures. If a falling sand block stair case falls, and some of the blocks turns into items randomly, this could also cause a player progression to stop.

Repro Steps:

• Open the repro world (attached).
• Walk down the corridor pressing the buttons randomly
• eventually a sand/gravel will break itself,

Observed Results:

sand/gravel will break randomly under its own weight. Even when there is only a handful of sand entities dropping.  it seems inconsistent when/why it happens. But seems to happen more often when more than 1 row of gravel is dropped at a time.

 Expected Results:

Unless sand/gravel is dropping in invalid locations or is timed in a way that it's dropping inside itself or another entity, it should be able to fall on other sand blocks. These are only 2 high stacks and for them to sometimes break for no apparent reason is a problem.

Screenshots/Videos attached: 

above, world attacked

Regression Builds:

Was tested working in:
probably never worked.

Notes:

Because of MCM-859 which results in erroneous block drops and  the gamerule not working, this is a bigger issue as a result.