Are there any feats of Stormtrooper armor vs bullets or physical hits in general? Preferably fast moving objects with small surface area.

The only ones I can think of are Chirrut breaking it in Rogue One with his staff and the Ewoks taking down Stormtroopers in RotJ. Which are not even remotely close to being on a level that could tank bullets.

Though I have not watched ether The Clone Wars, Rebels nor read any of the books so I am obviously missing a lot of sources.

I have seen quotes about it for Legends but nothing in canon so I am wondering if it is still even a thing.

From what I see people like to claim the armor can tank bullets like they are nothing, then never present any evidence to back up their position.