Trial spawners with silverfish can not spawn them at all or have unusually long delays between spawns.
How to reproduce:
Place down a trial spawner and use a silverfish spawn egg on it
While standing on top of the trial spawner, switch into survival mode (if not already in it)
Observed result:
The silverfish don't spawn at all.
Expected result:
The silverfish spawn as usual.
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If a player is within a couple of blocks from the trial spawner, it seems like it doesn't spawn silverfish at all. Hence why this issue is exacerbated on multiplayer. If the player switches game modes, the trial spawner will "think" that there is no player in the vicinity of 1-2 blocks and spawn the silverfish. Switching back to survival mode and killing the silverfish while being close to the spawner will result in the spawner not spawning more silverfish after the wave has been cleared.
Can confirm there is strange behavior with silverfish spawners, but this behavior doesn't seem to be exclusive to 3 or more players. Even with one, the spawner will not attempt to spawn silver fish, unless the player changes their gamemode into creative or spectator.
Example with one player:
Even though I change gamemodes quickly in the video, the behavior of waiting a long period between spawns is observable.