New feathers coming is uncomfortable and even painful for some, so it's not unusual for a rooster to stop mating during it. Usually roosters molt first before the hens.
In my breed, New Hamps which are a meat breed, they stop laying in molt. I have one hen where molting has started & she has quit laying. The other hen hasn't started molt yet & is still laying. Harry is also starting molt, those beautiful tail feather are going fast. He never tries to breed when a hen is not in lay. My 5 month pullets are not in lay yet so he pays them no attention. I am glad they stop laying so all of the protein can go into making new feathers.
Thanks, oldhen... and newhamp...! Sounds like as I figured, depends on the rooster. I will hope my guy is like Harry! Sounds like another sign of a good rooster.