"I don't really know what to call this" bug.

[TheOriginalCj]

So apparently if you have a player jump through glass, the surface of the glass is so thin that you can essentially pull the slightly epileptic-triggering maneuver of trying to ledge grab the unharmed tile of glass in front of you, to confound and dismay your foes.

https://youtu.be/sOZcJqRrcPo

Personally, I think the most strange part is the absolute silence.

[Esper]

By design.

By the way, you can pull off many map bugs because of the Map Editor settings, themselves, they can make a couple of bugs that probably all wont be fixed if you're thinking as an infinite tile possibilities and patterns, but whatever

[Vitamin E]

Just call it a ledge-grabbing glass bug. Your character appears to be trying to grab a single tile of glass out of the 3-4 glass tiles that are there.

[DreTheGamer]

Grabbing corners of glass bug?

[Gurt]

Fixed for the release version.
Parts of the grabbing mechanic has been improved for the release version.