This is quite weird considering that Hoglins can ride Minecarts so they should be able to ride boats as well. Seems like adult hoglins can only ride Minecarts atm but Baby Hoglins can ride both boats and minecarts. If the baby in the boat grows up, they can be then technically put into boats I guess?? The player also can't then hop on to the boat IF there is a grown up Hoglin in the boat
Note:
Also affects zoglins.
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This is not a glitch. Hoglins hitboxes are too big to fit in boats.

Confirmed for 20w27a, Also affects Zoglins
Can confirm in 20w46a.
Can confirm in 20w51a.

Can confirm in 21w03a.
Can confirm in 21w08b. Video attached.
Isn't it possible to make baby hoglins/zoglins dismount boats after growing up?
Can confirm in 21w15a.
Can confirm in 1.17.
Can confirm in 1.17.1.
Can confirm in 1.19.
Can confirm in 1.19.2.

Can confirm in 24w45a.
I've noticed that this applies to Zoglins as well.