Not A Bug [Legends Z-A OU] Greninja-Bond cannot mega evolve

[gamer999]

What type of bug are you reporting? Mechanics

What is the bug?
I can knock off Greninja's Mega Stone.

Are you able to replicate it? If so, how?
Use knock off on a Greninja holding the Greninjite.

https://replay.pokemonshowdown.com/gen9legendszaou-2470730718-s2dnphbpelnsyy7cvqquisepj0whsevpw

On turn 36 you can see it happen.

 

[Hydrametr0nice]

In the Legends Z-A mod, Battle Bond Greninja cannot mega evolve, so it can lose the mega stone. Not a bug.