The bug
As of 23w18a, when falling from a height onto the edge of a full block, the particles are created at the very edge of that block's hitbox. The same later became true of sprinting particles. However, this is only fixed for blocks with a full 16-by-16 top face: blocks with different collision shapes will still cause their particles to be generated in what is effectively midair.
How to reproduce
Place a single glass pane or iron bars unit
Stand on top of it
Sneak until you're at the very corner
Fly up significantly
Fall from that height
Expected results
The fall particles would be generated where the block's hitbox ends.
Actual results
They are not, and appear in midair centered under the player.
Further notes
This also works for sprinting and should be easy to test for.
Linked issues
relates to 9
MC-262777
Sprint-jumping on the edges of solid blocks can still produce the occasional incorrect sprint particle and/or create particles in midair
Open
MC-240029
Fire and soul fire produce block particles in some situations
Resolved
MC-1133
Whether or not a player experiences some effect is calculated based on the block under the center of the player
Resolved
MC-207949
Landing on boats that are in water from moderate distances produces water particles
Open
MC-240028
Water and lava have dedicated minecraft:block particles
Resolved
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