[GAMEPLAY] Shaco and Braum stacks bug

Tldr.: Shaco Q makes Braum stacks go back to 1 if used when the stacks would hit max.

So I've been playing in high mmr as a Vayne with a Braum support against a very skilled enemy Shaco jungle. Since I'm not sure if it's a Braum or a Shaco bug (or just a result from some inconsistent programming) I'm going to write down thoroughly what happened. Mind that this happened in a matter of 3-4 seconds as a fast reaction/high AS fight. Braum hit Shaco with his rock (I don't play Braum but he basically put the stacking thing on Shaco) then Shaco proceeded to ult. After he was revealed, I as Vayne with high attack speed build started hitting him with my autoattacks to stun him. When he realized what I was doing he used his Q to escape. He was at 3 and the 4th arrow was flying towards him, but after Q he emerged in the middle of running. Now this is nothing new but here's the interesting part: He still had Braum stack thingy on him, but it was on only one. I was able to see him clearly and it wasn't his clone too since that exploded before Q (killed by teammates). This all happened near a simple ward and unfortunately not a vision ward, but the stun time is longer than Shaco invisibility and also he ran pretty far. I'm not sure if this was a visual bug or a gameplay bug since we couldn't catch him to see if the stacking continues, but a Shaco should either get the arrow and be stunned in stealth or get the stack thingy off completely when entering stealth and only getting an autoattack damage (but not a new stack of Braum thing). This didn't impact the outcome of the game but it was very interesting and so to say weird. The weirdness was caused by the inconsistency and that's why I think this is a Braum but and not a Shaco bug. Since (also happened in that game) if a Vayne E hits Shaco as soon as he uses his Q the E will still push him in his new location. (In our case after the Shaco jumped it was still stunned by a wall, but one a Q range away, since he jumped into a location in the jungle crowded by walls. (Under blue side blue buff area.)