When falling on a block, a sound is expected to be played. However, falling on a spawner will not produce any sound, which is contrary to expectations. Other sounds seem to work as expected.

This issue can be reproduced even after reloading resources, deleting the assets folder, and restarting the game. The following message is printed in the log when reloading audio, which seems to be related:

Missing sound for event: minecraft:block.spawner.fall