Reproduction
Enter a boat (on solid ground) or a minecart. (Does not work for pigs, donkeys or horses.)
You will sink into the ground, now press F5, the player appears swimming.
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Can reproduce in 19w14a.

Relates to MC-97217
Confirmed. This looks very funny.

Does not apply to horses. Confirmed for boats and minecarts.
Hmm, I cannot reproduce with boats. Pigs aren't affected either.
Edit: Happens when a boat is placed on the ground, and not in water.

Will just note that this is the exact same bug as MC-147266. Certain entities cause you to register as being slightly into the block below them when riding, hence why boats only behave like this on land, and there is no effect on taller mobs like horses.

It's already marked as related and I think that's fine. The same person is also assigned to both.
I am aware that this is marked as fixed, but horses (and probably pigs) are affected as well if the ceiling is low enough, see MC-147503. This should be tested as well to confirm whether this issue is fixed in the next snapshot.