Japanese monks and emperors kept meticulous records of cherry blossom festivals for 1,200 years. They accidentally built the world's longest climate dataset

https://sh.itjust.works/post/57803561

It’s there a difference in tone or meaning between accidentally and inadvertently? I feel like accidentally means they did something that was a bad thing.
I agree, but I think here “accidentally” is used in an ironic manner because this is of course not actually a bad thing.