VOV והיבוסי WITH TAG ON EXTENSION
Mikdash Me'at (275:45)answers bnai yonas question how can osios lefufos be kosher , we know אין שיעור לעובי האותיות? Mikdash Me'at answers that if we can tell that its a tag not part of the letter it is kosher.
My first impression was that the case here is a vov with a kotz, however since it is a question that is not clear cut and needs sofer or poseks discretion, I showed it to a colleague who disagreed and felt its posul, the fact that the tag is sitting on the protrusion makes it part of the rosh.
We showed it to 2 rabbanim and we still have nobody that feels he can be machshir.