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when you go up the bubble elevator to the top, they start spawning, but not at the bottom
Spawners require a player to be within 16 blocks. You should notice some flame particles inside the spawner "cage" if you are within range. Funnel the zombies into a soul sand elevator before dropping them so that you can stay closer to the spawner.
https://minecraft.wiki/w/Monster_Spawner#Mechanicsyeah that ended up being the issue