some emotes lock you in first person depending on your scale. it doesn’t apply just to the potions, but also to the workshop playermodels. an easy way to recreate this is to use a default playermodel, equip a tiny potion, and use some emotes.
i’ve found that this happens with the frog, vibin’, worship, anonymous, sleep, sit, and lay back emotes, and all of those emotes offset the camera lower to begin with. (including lighter sway, but it’s not enough to force the player into first person)
this seems to be an unintended side effect from the “fixed emote camera offsets not colliding with the floors, which allowed the camera to clip through the ground” fix. i would guess that, due to the camera offset of being smaller and the offset from those emotes, the camera is too close to the floor and forces the player into first person, similar to how you can’t be in third person with your head against a wall.
edit: in rooms with thin floors, (canvas cubes below 0.57 z scale also work) emotes like worship, sleep, sit, and lay back force your camera to go below the floor if you’re in third person when using a tiny potion.