Parry not triggering
Parry is not triggering in many cases, even when the timing is right.
It's especially noticable when using Nebula. It happens often that her shock charges turn into shock debuffs, which means it was a "well timed block", in other words a block that should have triggered parry stun. But despite that it did not occur.
And no, there was no ability reduction in play, even if there was, there'd at least be the green parry text popping up, which wasn't the case either.
So it's not that parry timing has changed, it doesn't trigger when it should.