I don't know of any cases specifically from protests. And this time most of the cop riots seemed far more focused on cracking skulls than surveillance - it seemed more about defending their egos against status attacks than more carefully planned oppression.

But there have been many cases of cops forcing or attempting to force phone unlocks, and more where they coerce unlocking by lying about the law. Which is perfectly legal - the cliche about cops being being paid to lie is perfectly accurate, if not a full explication of their duties.

Feelings of safety are pretty individual. Apps that access personal data of importance don't live on my phone that leaves the house.