I was testing the new snapshot features when it occurred to me to put mobs on the happy ghast while riding it. However, when I mounted it, the mobs fell off. I then tried using spawn commands by spawning them right on top of it and found that they pushed it as if it was a normal mob. I don't know if this behavior is intentional or if it's a bug, but if it is, better have it reported.
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After consideration, the issue is being closed as Working as Intended.
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