Sidekick out of wall under ceiling, hits the ceiling during sidekick

[FawFul]

As the title describes, a very specific movement bug. Some tests require you wallclimb into a masked tile, then sidekick out of it. If there's a ceiling directly above you, you hit the ceiling. The way to avoid it is to jump a couple of times inside the mask and then sidekick. Sidekicking after getting stuck always results in bumping your head halfway through the sidekick.

[Violet CLM]

What part of this series of events is described as the bug? Obviously wallclimbing is a bug, but I assume that part you don't want to get rid of.
Assuming some part of the described behavior is undesirable, what would be the desired behavior?
Is this a vanilla bug, a plus bug, or both?
Is there an example .j2l? And, ideally, a .j2m?

[cooba]

Faw you can post these directly on GitHub now.