Merchants: Sneak with merchants failing/bugging?

[Silent]

So after a lot of sneak banking, and vendor buying ever since velious release I noticed that if your already sneaking with the vendor window open, and you try to sneak again, you fail, 100% always fail. Not sure if this is intended or not.

NOW the main issue, once you get off the vendor and go to say, sneak/hide again to get away from guards safely. Your first sneak will ALWAYS fail with another 100% rate. Second one works pretty much always depending on skill.

I do not know if this is classic, a bug, intended or what. I don't think that it should always be a 100% fail rate to sneak AFTER leaving the vendor window entirely.

Anyone able to shed more light onto this, classic/broken/bug or?