Joe Jonas made a surprise cameo in last week’s “Saturday Night Live,” singing the bridge on the digital short song “Big Dumb Line.” But sources tell Variety that part was initially written for musical guest Morgan Wallen, who turned down the part.

In the sketch, Bowen Yang, Chloe Fineman and host Mikey Madison sing a Europop-inspired song about waiting in “dumb” lines in New York for even dumber foods, like “palad” (pizza + salad) and “fandy” (fish + candy).

NBC could not be reached for comment.

Wallen played two songs on “SNL” from his upcoming album “I’m the Problem.” The country star stirred up speculation after he abruptly exited the stage at the end of the episode, skipping out on the show’s hugs and goodnights protocol, and then posting on Instagram, “Get me to God’s country,” which was seen as a slight against “SNL” and the city of New York.

Sources in Wallen’s camp told Variety the day after the episode filmed that Wallen had no tension with “SNL” and stressed that the singer had a good time. Wallen did not intend to snub the series with either his prompt exit or his Instagram post, they said. A guest in attendance at the “SNL” dress rehearsal taping confirmed that Wallen walked off the stage in a similar fashion to what happened during the live taping.

“SNL” veteran Kenan Thompson was asked about Wallen’s unusual exit, telling Entertainment Weekly, “I don’t know what goes through people’s minds when they decide to do stuff like that. I don’t know if he understood the assignment or not, or if he was really feeling a certain kind of way.”

Thompson continued, “You see somebody before you get a chance to say hi or say good job or anything like that, they just dipping. I thought maybe he had to go to the potty or something… It’s definitely a spike in the norm. We’re so used to everybody just turning around and high-fiving us, everybody’s saying, ‘Good job, good job, good job.’ So when there’s a departure from that, it’s like, hmm, I wonder what that’s about?”