if you try to summon any mob using a spawn egg facing on the top of a block, it will spawn inside the block.
PS: idk if thats a bug, but horse egg spawners do can spawn baby horses sometimes also (without a adult horse)
EDIT1: My game crashed bcs of my computer later, and now the bug about spawning inside blocks isn't happening
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Thank you for your report!
However, this issue is a Duplicate of MC-141100.
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Were you on a superflat world?