New sound effects and events were given to the monster spawner block in 24w33a.
Among them, there is no sound event named "block.spawner.fall", whereas all other blocks in the game have a "block.[blockname].fall" sound event.
This also causes the message: "[Render thread/WARN]: Missing sound for event: minecraft:block.spawner.fall" to appear in the log upon reloading resource packs.
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Can confirm:
[media]
Fixed in 24w46a.

I also think this is fixed. Sounds.json now properly contains a definition of the sound event.