So you did actually do that. It's a code violation. You cannot have a 50 amp outlet type on a 60A breaker. Code is very specifically clear on that. It says the overcurrent protection device must be no higher than the rating of the outlet.Nope. Oversized that one due to the location of the 14-50 box. That way I can turn that outlet into a junction box if need be without running additional wiring or install a HPWC if I wanted. Don't worry, the #4 wiring supports 60A so it's not just a breaker. It's truly a 60A circuit and not just a 60A breaker.
It's fine to have the oversized wiring in there right now to prepare to change it to something later, but you can't have that 60A breaker on it right now with that outlet. It needs to be changed to a 50A breaker to match the outlet for now.