ATLANTA — The Knicks have a Mitchell Robinson dilemma.

Not with his production, though that also wasn’t strong during the Knicks’ Game 3 loss Thursday at State Farm Arena. But rather with getting their best rim protector and offensive rebounder on the court, given his ongoing struggles while sharing the court with Karl-Anthony Towns.

And with Towns scoring 21 points and helping carry the Knicks’ offense down the stretch, that meant Robinson finished with just 11 minutes, two points and four rebounds during their 109-108 defeat — and didn’t play for the final 9:25.

“We need something from everybody, and the reality of what happened was — we ended up going with KAT, KAT played a significant amount of minutes for us because he was rolling in that second half,” head coach Mike Brown said when asked about Robinson, who wasn’t available in the locker room postgame.

It served as a stark contrast to Robinson’s Game 2, when he finished with 12 points on a perfect 6-for-6 shooting and seven rebounds. That was the blueprint. That was a blend of rebounding — his strength — and what he could provide on offense, too. And after the Knicks allowed 42 points in the paint during the second half of their loss Monday, giving more time to Robinson was a logical way to fix that.

But three nights later, Robinson disappeared. His lone basket occurred with just under four minutes remaining in the first half, when Jalen Brunson hit him on a roll to the basket.

Robinson didn’t attempt a free throw the entire game, either. The Hawks didn’t need to use the hack-a-Mitch strategy when he wasn’t on the court late in the half to begin with, and it was only the seventh time this season when Robinson finished with four or fewer rebounds in a game.

Brown talked about the lingering issue pregame, too — with how Robinson and Towns have struggled to share the court together — and how the only two ways for Robinson to log minutes are to have them play together or to have Towns play less.

Ideally, Brown said, he’d want Robinson to play 25 minutes. He’d want Towns to play between 32-34. But that’s not the reality the Knicks are facing at this point in the postseason, trailing their first-round series 2-1 and desperately searching for lineup combinations that work.

“The combination of the two of them right now hasn’t been great,” Brown said pregame, “and so, I’m choosing to not play them together right now during the series a lot because of the matchups and stuff like that. At the end of the day, it’s a choice.”

Then, that issue materialized in real time.