Meshes not rendering properly (Stretching, not rendering at all, etc)

[pizzas_king (Mr Clementine)]

Certain meshes are not rendering properly in-game (joining actual place), but render perfectly fine in studio tests and previews.
I have attached a place file where you can see this exact issue occurring and can be replicated by following the above instructions
stairs.rbxl (59.2 KB)

Results will look like this

Expected behavior

The result should consistently appear like this BOTH in-game, and in studio tests and previews.

[APandaPoet (熊熊熊)]

The broken rendering in RobloxPlayer has the same cause of the reported issue here.
Please check the thread for more details. Thank you!