IC asked this in a PM to me, but there's no reason not to share it with the caveat:
First a caveat: it has been 3+ decades since I worked in flt ops directly, and my experience was mostly on CF6 and bigger engines. However, I doubt if that has any significant effect on this issue.
That said, MCT is a cert limit, whereas MCL (CLB) is imposed by the engine maker as a warranty limit. Thus while running above MCL up to MCT may cause the airline and CFM (the company) to haggle over engine deterioration rate, no laws have been broken.
Note also that for some engine models, some or all of the MCL power management schedule may in fact coincide with MCT. In this case there is no real issue.