fix: Custom messaging manager exception#3417

NoelStephensUnity merged 4 commits intodevelop-2.0.0Unity-Technologies/com.unity.netcode.gameobjects:develop-2.0.0from

fix/mttb-1229/2.x/custom-messaging-manager-exceptionUnity-Technologies/com.unity.netcode.gameobjects:fix/mttb-1229/2.x/custom-messaging-manager-exceptionCopy head branch name to clipboard