Should I be concerned that my baby, around the time that sleep regression hit, stopped rolling from tummy to back?

Now that we are past the sleep regression I thought they would go back to rolling, since I figured they were just cranky during the sleep regression.

But during tummy time, when they have decided they’re done, they just cry. I’ve tried not jumping into action immediately to help them get out of tummy time to see if they were just being stubborn or would roll themselves over when wriggling around and remember they CAN do it themselves. No success so far.

They’ve been rolling over from tummy to back since 2 months old.

At what point should I be concerned? Are they just being stubborn or could it be something else?