[BUG] AnimatePresence won't unmount fastly changing content

[alisasila]

Bug description:
Hi,
I'm using AnimatePresence to animate text that shows up while hovering over some tiles.
I noticed that if I hover quickly over the tiles, AnimatePresence will play the text animations correctly, but will not unmount the component after the exit animation plays.

I want said animation to happen every time a user hovers over a different tile, so in my case the animation happens when:

1. The key of the HoverText component changes (according to the index of the tile, and the text being shown - makes sure it has a unique key).
2. The HoverText component mounts and unmounts (mouse enters tile, mouse leaves tile).

CodeSandbox:
https://codesandbox.io/s/animatepresence-quick-key-change-bug-zggbr?file=/src/HoverText.js

Steps to reproduce:

1. Go to the sandbox linked above.
2. Choose a single tile and hover over it - notice the text above pops up
3. Now stop hovering over the tile - AnimatePresence correctly animates and then unmounts the component.
4. Now, quickly hover over all the tiles from side to side, and then stop hovering over the tiles - notice how AnimatePresence animates them all correctly (both in and out), but for some reason does not unmount the component after finishing the exit animation.

Video of bug:

Correctly animates, and then unmounts:

correct_behaviour_animatepresence.mp4

Correctly animates, and then doesn't unmount:

incorrect_behavior_animatepresence_BUG.mp4

Also, sometimes if you hover over a couple of tiles slowly, the component does unmount, but this behavior is not consistent.

I am using the exitBeforeEnter prop on my AnimatePresence, but the problem persists even without it.

Expected behavior:
After a user hovers over the tiles quickly, AnimatePresence should unmount the HoverText component after its exit animation.

Environment details:
Using Chrome (Version 87.0.4280.88) on Windows

[Lukavyi]

I have the same issue

[utileetdulce]

This seems to be related to
1534
1439

[silverprize]

Look at this issue please.

[Van4e3WT]

This problem is still observed to this day

[mikkmartin]

Ran a few tests and It seems version ✅2.0.0-beta.77 it seems to work and bug is introduced in v ⚠️2.0.0-rc.1

Hope this helps to diagnose @mattgperry.

Meanwhile a potential workaround #1682 (comment) (haven't tested myself).

[mattgperry]

Since fixed