I've got some mcpr files created with badlion Client, they are on 1.17.1 which is no longer supported by badlion. So i installed the fabric replay mod, it shows the replays in Minecraft. But when i ...

What issue are you having? Original gameplay works fine. But trying to play the "replay" of the replay mod crashes the game but only if FTB Quests/teams is installed in the modpack.