Saying this is WAI or invalid is coward! At least say "We know this is not intended, but fixing it is too complicated. We will still keep that bug in mind and maybe fix it in the future"
The part of floating on top of a donkey (MC-48179) is actually caused by this bug here.
As donkeys and horses are treated the same way, they have both the same hitbox sizes and also the same riding player height, which makes of course not so much sense because donkeys are not as tall as horses. Also the hitbox bug can be seen when pressing F3+B . You will see that the eye level (red line) is too high.
Actually the hitbox bug isn't that bad at the moment (1.8.2-pre2), because horses also have an incorrect hixbox height
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Maybe causing MC-20431

_TEST when fix for MC-20431 is released (15w48a ?)
edit by redstonehelper: Not fixed.
Can confirm for MC 1.12.1.
Confirmed.
Confirmed for 1.13.2 and 19w13b
Can confirm in 20w51a.
Can confirm in 21w03a, however this no longer affects donkeys. Donkeys have a slightly smaller hitbox than horses & mules.

Yes in 21w03a (and probably earlier) the hitbox of donkeys is slightly smaller. However, the sitting position is fixed for all of them.
It might make sense to resolve this report because for all of them the hitbox is actually too low causing the eye level to be too low as well (see MC-143184), and moving the eye level outside the hitbox is not a good solution because (if I recall correctly) it is used to determine whether an entity suffocates (see also MC-163673, unless that changes in future versions).

Can confirm in 23w31a

I can confirm this in 24w19b and attached an image demonstrating the bug.
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Can confirm in 1.21.4.