Just like ball pythons, when you move them to a new home, you should give them time to adjust. 3 days is barely enough for him to have explored the whole new cage. Give him a week to even a month and see if that helps.

IF your old cage maybe didn't have high enough temps, or didn't have deep dirt, etc.. it could be that he's acting more naturally than he did before. Perhaps he's just busier playing in his new space, and isn't as interested in seeing what you have right then? Given time to become used to the new cage, he might revert back to his old behaviors.

I wouldn't worry about him getting stuck, honestly. They LOVE tight hides, especially flat spaces to wedge themselves into. Unless you have an actual hole that he has to fit THROUGH, he should be fine. They are like weasels, in flexibility.