UPDATE MC-1691 HAS BEEN REOPENED THIS IS A DUPE
When sprinting/landing on floating bottom trapdoors, there are no particles. Trapdoors in all other configurations produce particles when sprinting/landing. Related bugs are MC-1691, as the game is likely attempting to show the particles of the air below, and MC-8820, which is similar.
What I expected to happen was...:
Particles to appear when sprinting on bottom trapdoors when there is no block underneath
What actually happened was...:
No particles appear
How to reproduce
Place down trapdoors of any type in the air (no blocks below them at all). Make sure they are on the bottom and not the top, and keep them closed.
Sprint or fall onto them, no particles appear (they do appear if the trapdoor is opened/on the top of the block)
Related issues
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migrated
migrated
dupe of MC-1133
eman7blue
how is this a duplicate of MC-1133? If this is a dupe it might as well be MC-1691, but as that was resolved as Works as Intended, I created a new bug report for this issue since it seems like the particles should appear as they do when sprinting/landing on trapdoors in other configurations (bottom opened, top closed, top opened).
muzikbike
Can confirm this affects 1.20-pre4, and that it also affected prerelease 2. Very obviously not a duplicate of MC-1133 since it was fixed and this has not been. It may, however, be a duplicate of MC-1691 as mentioned. In addition, no sounds are produced either, but that would probably come under MC-8820.
If this does end up being a duplicate of MC-1691, it might be worth having that ticket reviewed given recent events.
[Mod] Jingy
MC-1691 Has actually been reopened now, and this issue does in fact duplicate it.
The falling and running particles are gotten from the block below the bottom trapdoor, which is air. That's why the particles are not present.