[fxtentacle]

Most likely, the author is using counterfeit hardware.

I haven't seen authentic ones in stock anytime this year. And bugs in rare edge cases is precisely what I would expect from a price-conscious copy.

[jpieper]

Surprisingly, it is almost certainly genuine. These particular chips likely came from a batch delivered in April of 2021 from Mouser, who isn't known for their shoddy sourcing practices.

[duskwuff]

It's also a relatively new part which hasn't developed the kind of demand that leads to counterfeiting yet.

Most of the counterfeiters are targeting well-established old parts like the STM32F103.

[fxtentacle]

Agree, I've never had bad experiences with Mouser.