Hello, I´ve trouble to find the correct MSL Rating for the part STM8S001J3M3TR. We have two Reels. One with MSL 1 (Date Code Year 2020) and one with MSL 3 (Date Code Year 2019). Digi-Key shows MSL 3 but Avnet MSL 1?! Which one is correct?Any idea?

[TReit.1]

Could they both be correct?

Moisture sensitivity level would change, (I suspect) due to packaging, die, manufacture, fail rates. All sorts of things.

I think in general you need to follow what is on the paperwork.