If you use the "pick-a-block" button (mousebutton 3) on Mobs, you will get an invalid spawn egg.
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Confirmed.
Related to MC-86085.
Pick blocking splash potions in an item frame gives you Splash Water Bottle
.
Edit: Oops! I accidently forgot to write "in an item frame." Sorry. 😛
Related to MC-83471
No, it's not.
Edit: Well, it is, but not closely.
Confirmed for 15w33b.