Well, until (and unless) the Mississippi Senate and House work out a mutually agreeable bill and the Governor signs it, it remains 120 days.
But that has always been "within 120 days".
I.e., that is the longest they can wait. The agency has always had the authority, if they wished, to issue it sooner.
Until recently they have opted not to do so.
Sounds like they may be issuing them sooner according to the OP.
In cases where the House and Senate cannot agree to common language, the bills just die for lack of a compromise. That would leave the current 120-day limit in place.
Occasionally when the Senate and House disagree on numbers, they agree to an average of what each side wants.
But that would be weird in this case (120+45)/2 = 82.5 days
Conservatives have faith in individuals; liberals put their faith in the government.