Zodiac, has there been a rule change recently about 2nd rounders? They've never been guaranteed - hence Didi coming to the Kings - and could technically sign for absolutely anything.
Not to my knowledge, and I should've clarified first year is guaranteed if they're signed but the same goes for first-round picks too there's been first-round picks who have never signed their NBA deals Fran Vasquez comes to mind chose to stay in Europe instead.
I think you'll find the contract Didi just signed was his second-round pick deal. First year (this season) guaranteed (pro-rata obviously) and next season will be the non-guaranteed second year that won't become guaranteed financially unless he makes the Pels opening night roster.
The Pels owned Didi's NBA rights meaning he couldn't sign with any other team and he had to accept his second-round pick contract or get nothing.