Video related, if you enter c1a2b while touching the wall on left, you'll get stuck.
https://streamable.com/68jdg
Game version:
Protocol version 48
Exe version 1.1.2.2/Stdio (valve)
Exe build: 15:17:55 Jul 24 2019 (8308)
This is not C1A2B related only. If you stuck in edges during level change player starts stuck in next level. This happens because the levelchange trigger slighty warps player to the next level. If the player is on edge, levelchange trigger warps you inside of that tiny edge.
Agreed, happens in many areas especially in level changes through vents
Most helpful comment
This is not C1A2B related only. If you stuck in edges during level change player starts stuck in next level. This happens because the levelchange trigger slighty warps player to the next level. If the player is on edge, levelchange trigger warps you inside of that tiny edge.