Load the participant by session as loading by actor is prefetched onl…

…y as attendee

Signed-off-by: Joas Schilling <coding@schilljs.com>

lib/Controller/SignalingController.php

@@ -544,7 +544,15 @@ private function backendRoom(array $roomRequest): DataResponse {
 			}
 
 			try {
-				$participant = $room->getParticipantByActor($actorType, $actorId);
+				if ($sessionId) {
+					try {
+						$participant = $room->getParticipantBySession($sessionId);
+					} catch (ParticipantNotFoundException $e) {
+						$participant = $room->getParticipantByActor($actorType, $actorId);
+					}
+				} else {
+					$participant = $room->getParticipantByActor($actorType, $actorId);
+				}
 			} catch (ParticipantNotFoundException $e) {
 			}
 		} else {