That wasn't the situation with Lauryn. She was sued by 4 music arrangers
who produced and arranged all the songs on her album. She was forced to settle, because they had proof that they produced everything, and Lauryn took credit for it.

They were suing her for partial credit on 13 of the 14 songs on the album! And like I said, she had to settle.

https://www.rollingstone.com/music/music-news/lauryn-hill-settles-lawsuit-251366/

And she is still facing a lawsuit from another musician for one of the songs on the album...not sure if that is still on the table


And producing/arranging and being a session musician are not in the same arena. A session musician is brought in to play for certain parts on a song or for many different parts on a song on one or several songs, and they do it by the hour, or per song, or per session, depending on what their rates are. The cats that sued did way more than that, they arranged, the produced, etc.