Credit to _MethodZz_ for finding this bug.
The bug
When a falling block slides over a fence or cobblestone wall, it can land on blocks it is not supposed to.
Steps to reproduce
Build the setup in
Place a sand block under the observer
→ Notice the sand will land on top of the torch
Furthermore, if there is no torch, the sand will just drop as an item.
Related issues
relates to
Attachments
Comments


Affects 1.16 pre2

Confirmed in 1.16 Pre-release 8.

Affects 1.16.2 Pre-1

Affects 1.16.1

This ticket in progress ~500 days
Can confirm in 20w51a.

625 days and not still resolved.
Can confirm in 21w05a. Also, @unknown, and @unknown, please be patient when waiting for tickets to be handled/fixed. The team are very busy people are some issues are more important than others, meaning that some will not be dealt with after a long amount of time. I assure you that this will eventually be handled when the team feels that the time is appropriate.
Can confirm in 21w05b.
Can confirm in 21w06a.
Can confirm in 21w07a.
Can confirm in 21w11a. Video attached.
Can confirm in 21w17a.

Can confirm in 1.17.1 Release Candidate 1.

Attached a video with an alternate setup based on MC-183171, if ever the first one stops working for some reason.