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Bug
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Resolution: Unresolved
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None
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1.15.2, 20w16a, 1.17.1, 1.21
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None
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Confirmed
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Entities
The bug
Shaking falling blocks (gravity blocks that turn into a block and back into a falling block over and over again) will break and drop when the world is reloaded. This happens for all types of gravity blocks, like sand and gravel.
To reproduce
- Build the contraption shown in this screenshot
(redstone dust goes under both pistons)

- Right-click onto the note block once if you haven't triggered the observer already
- Place a sand block on top of the pistons against the polished diorite block
- Close and reopen the world
→
The sand block drops
Original description
I have a sugar cane farm and it gets destroyed everytime I join my world, no matter if I fix it or not, keeps destroying (the sand somehow dissapear so the water goes off destroying redstone)