Zibanejad has one point, an assist, in the past nine games. He has one goal in 12 games this season after scoring 41 in 57 games last season.
"I felt like my own self today," the center said. "Obviously tough with the loss, but felt a lot better today."
Wagner scored shorthanded on a breakaway off a turnover by Artemi Panarin 1:18 after Rask made his save on Zibanejad to tie it 1-1 at 9:41.
The Bruins thought they had taken the lead at 4:53 of the third period. DeBrusk's shot hit Georgiev and then the crossbar before bouncing down on the goal line, but the puck did not cross it. The no-goal call on the ice was confirmed by video review.
"I think if the call goes the other way and they call it a goal, then it probably stands," Cassidy said. "That's what happens a lot of the time. But at the end of the day, they didn't see it that way and that's the way it goes."
NOTES: Quinn said Panarin sustained a lower-body injury, which is why the forward played one shift totaling 1:28 on the power play in the final 15:50 of third period after leaving the ice in apparent pain. He didn't play in overtime. … DeBrusk had an assist and a game-high seven shots playing 14:08 in the forward's return after he missed five games with a lower-body injury. … Grzelcyk played 11:40 and was minus-2 in his first game after missing four with a lower-body injury.