Some mobs don't appear to be inside mob spawners.

Bees - don't appear but do spawn

Endermen - don't appear and seem not to spawn

Polar bear - don't appear and seem not to spawn

I thought pufferfish didn't appear but there just sooo tiny

shulker spawners are amazing, they spawn a secret type of shulker, the elusive white shulker that once killed drops normal purpur coloured shells, is this because you(Minecraft devs) were going to make shulkers spawn with random colours and different shells instead of just purpur? only white shulkers spawn from the spawners and is visible inside the spawner...............NVM lol I thought they were always purpur coloured but when you summon them they are white as well.............................

Wolf - don't appear and seem not to spawn

Zombified piglin - don't appear but do spawn

That took way too long to go through all the different mobs lol