When using a spawn egg on a (matching) animal, it won't show the use animation, while it uses the item to create a baby animal.
Also, it looks like the 'use' animation slows down the next-use time, while no animation does not slows down the next-use time.
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Confirmed in 1.8.3. What do you mean by "the 'use' animation slows down the next-use time"?

That sure is a late response, Isaac (only 6 months after opening!) 🙂.
Yes, this thing is still present in v 1.8.3 and should be fixed I think.
its harder to spawn mobs compared to spawning their baby versions, because of this no-delay action.

I haven't noticed any delay, just the "no animation" thing.

Seems to affect 1.13.1. See MC-136670.

Affects 19w14b
Confirmed. This can make it difficult to tell whether or not you've used the egg, and may result in people spamming it, producing many babies unintentionally.