spawnanimations-v1.9.2-mc1.17x-1.20x wither rose issue - some disappearing

[bobdabutcha90]

Describe the bug

Wither Roses (so far the only thing I experienced) randomly and frequently disappearing on an increasing rate. (mod installed and enabled on server)

I experienced this issue while I was building/testing my wither skeleton farm on my creative server.
Built a spawning platform, covered the whole top layer with wither roses, added the drop chute, started to test it and then I saw from my AFK/Killing chamber that the platform after 1-2 minutes of using the farm started to spawn blazes and zombified piglins.
I checked the spawning platform , wither roses are missing around the drop chute (3x1 hole with trapdoors to make the skeletons fall). I was thinking I maybe missed it out / mobs destroyed it somehow etc.. so I placed back the wither roses and went back to the AFK post to test again.
Same amount of time and again, Blazes and Zombie Piglins started to spawn, went back to check, again around the drop-chute (not exactly in the same pattern) - wither roses are missing - no floating entities so it was just gone.
Tested again a few times, same results, even more wither roses missing if I run my test for a longer period of time.
Tried to troubleshoot this by replacing the platform, checked if the mobs "trample" the wither roses, or maybe the trapdoors could be the problem?
I was in "Free Camera" mode my view was fixed on the blocks from where the wither roses keep disappearing - of course nothing happened but as I was checking one part of the platform, in the meantime the wither roses disappeared from around the other drop chutes. While I was turning my POV there, the wither roses disappeared from next to me as well. Just gone, no dropped wither rose, no mob around to trample it down, checked with and without the trapdoors same result.

Then I removed the mod from my server - wither roses are no longer disappearing. Tested it for an hour, every rose stayed in it's place. I googled a lot and did not found anything about "disappearing wither roses".
I thought this report could be useful if anyone would be running into this specific scenario, or if you would be interested checking this out. I'm no coder at all, but I'm curious what could be causing this as it was so strange.

Steps to reproduce

1. Build a spawning platform in the nether from netherrack 38x38
2. from each corner go diagonally inwards 10 block, on the 10th block, put a marker that is the center of 1 quarter of the spawning platform.
   3, add buttons on the floor around this block, only go out one layer, so technically cover a 3x3 area with the buttons
   4, dig a 3x1 hole at any side of this 3x3 rectangle, add trapdoors opened to it
   5, place wither roses on the platform, go away from the platform at least 28 block to let the skeletons start spawning

PS: in my world the spawning platform has a glass ceiling and 2 other layers with 3 block height difference (to allow skeleton to spawn) - 0 light level needed

Expected behavior

approx in 1-2 minutes you should see that blazes/zombie piglins start to spawn above the wither skeletons as the wither roses will be missing from some places

Additional context

MC version: 1.20.1 Fabric (Client)
Server: Vanilla 1.20.1

I can provide further details if required, but this pretty much sums it up.

[Tschipcraft]

Thank you for the bug report!
This may be an issue with my wonky system that tries to support all blocks for the block particles + sounds and not just the hard-coded ones.

• On what type of block are the mobs standing?
• Have you tried turning off the option "Play animation on unsupported blocks" in the settings?

[bobdabutcha90]

Thank you for checking on this!! :)
The mobs spawning on the Netherrack (non-transparent) block with wither roses on it
I will try the setting you advised, and will update the thread, thank you

[Tschipcraft]

Any updates regarding this @bobdabutcha90?