[GAMEPLAY] Vayne with Yuumi Stealth does not work - Possible Vayne only bug

I've been noticing in games where I have a Yuumi support enemies have been attacking me in stealth and acting like they can see me 100% in stealth even with 0 vision, I don't know if its a Yuumi only bug or a new Vayne bug.

I am unsure how to reproduce except by possibly having Yuumi as a support I've been pegged without recent attachments so it's possible its either the Attachment or her Healing effect giving visibility?

Possible Reproduction steps: 1 - Attach Yuumi to Vayne 2- Stealth Tumble 3- Enemy can attack you/see you when they shouldn't

It looks to happen all the time at least from a game to game basis and changing skins does not change this outcome.

I rewatched recordings of my own gameplay as well as loaded in the spectator and turned visibility off my side and both are consistent with me being seen despite not showing it on spectator and me having stealth overlay on.

https://ibb.co/1qbBMr5 https://ibb.co/RSGkjKG https://ibb.co/CsMmGTw

These 3 screenshots are Vayne tumbling in fog of war and walking into the lane and Cassio Qing my perfectly without any vision.

https://ibb.co/CBmSnx1 https://ibb.co/FYtxYgS

These screenshots are stealth vayne getting cassio ulted and actually clicked directly by jhin / Cassio E