Jhin W Mark
I don't run a replay system so I don't have any frames of this, but I feel it is worth spreading awareness.
It seems, (under potentially specific circumstances) that enemies can't always see Jhin's W mark. It happened to me just last game, where I held flash for Jhin W because I wasn't marked, but then got rooted.
If anyone encounters this and can catch a frame, that would be greatly appreciated as that makes him VERY hard to play against