Created a new world then started flying around in creative mode. As I approached a savanna plateau, four horses spawned and began to immediately suffocate.
I did not expect the horses to spawn and immediately start suffocating.
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Could you provide seed and coordinates please?

Seed: -5763284339751045993
After several attempts to get a screen shot, I got several showing the horses suffocating after spawning but not spawning in air. Updated bug report to reflect this.