Experience orbs block the rendering of mobs they are in front of, allowing the player to see through them.
Note that the translucency of experience orbs is an intentional feature and should be kept - see MC-163034.
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Can't reproduce on 1.15 pre-release 2. Orbs are translucent and mobs can be seen through.
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Will test this again later.

Can you try this again, looking through an experience orb at a mob that existed in the world before it, and then at one after it?

I just tried this in a superflat world. About 80% of the animals disappeared behind the experience orb while the other 20% did not. I tried this without mob spawning turned on, so from what I just saw, it doesn't matter if you're "looking through an experience orb at a mob that existed in the world before it" instead of "one after it."

Definitely seemed time related to me.
Can someone reopen this?

I tested this and it has to do with either the distance of which you are looking at the mob through the orbs or different orbs render differently or orbs stack and change the render.

Fixed in 20w22a