Hostile mobs are able to reach players riding camels

Steps to reproduce the issue:

In creative, spawn a camel and some zombies, give the camel a saddle. Ride the camel and switch to survival. The zombies then will attempt to attack you.

Expected result:

The zombies are unable to reach you with their attacks while standing at the same Y level.

Actual result:

Sometimes the zombies can reach you with their attacks and are able to kill you even while stood at the same Y level.

There does seem to be something more to this issue since it isn’t 100% and sometimes it works as expected, but with enough tries it happens where the zombies are just able to attack you while being stood on the same Y level as you. I’m unsure if it’s due to changing between creative and survival, or the camel sitting and then standing or something else.