So basicly you have an even more worse issue. Okay.

I stumbled across this issue when a friend of mine told me about it ingame. For me, due to weapon swapping, I constantly had to re-apply it - so I never noticed it up to that moment where I had ML on both action bars aka constantly active and was zoning with it and not re-enabled it. Checked my stats and crit was waaaay lower.

So Magelight itself was not active, but the visual showing.