I found this bug when i was duplicating my trampoline that use velocity setting as jump part and after i duplicated it the part that i duplicated reset the velocity to default setting.
Original part.
Duplicated part
This bug happend 100% of the time. it super annoying when i try to duplicate my trampoline and need to set velocity back to 400.
im not sure if this happend to mac user too because i dont have macbook.
To duplicate the bug try set velocity to random number and try to duplicate it and check duplicated part velocity it would reset to default.