[G] Crouching on boulder, doubled-platforms cancel stance...

[Triple J]

This bug is rather hard to explain, and I couldn't fit the whole general idea of this bug into the thread's title:

As specifically as I can explain this, if you are crouching/riding on a rolling ball and the ball comes in contact with two different levels of ground below that are extremely close together, you are unable to ride the ball at that point while trying to crouch.

I suspect it may be because the ball instantaneously shifts upward a number of pixels whenever it goes onto slightly higher ground from below, but I'm not really sure.

The bug can be a minor issue if it comes in contact with a moving platform, but you must not get off the rolling ball (nor leave it behind). This is usually the case when the moving platform goes through the ground.

[Triple J]

You are also unable to crouch/ride on top of a rolling ball while it is on a platform that is moving downward at all. This can make some puzzles annoying when this kind of maneuver is necessary.