When attempting to set an empty mob spawner to spawn a specific mob (using spawn eggs), I can't set the spawner to spawn Squid, Tropical Fish, Salmon, or Pufferfish, basically any sea creatures.
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No. It just results in regular spawn egg behavior (Spaw a single instance of the given mob). I can try again (maybe it was just a fluke) and all comment my findings.
I think it's probably the same issue as described at MCPE-33615 and MCPE-33872, where the water block acts as a barrier in front of the player.
Does it work if you move very close to the spawner?