Hi All!
I have been playing this game for two days and experimented a bit on the issue and found a slightly simple work around.
If you can ever anticipate a cut-scene happening/ know theres going to be a boss fight to work around this bug. The key is to have party memebers ‘warp’ into the scene. :
1) have one person be the initiator.
2) All other members be a distance away, but not too far.
3) Waiting members must not be in combat, this will automatically disqualify them from entering the instance. Moving around a bit with or without your weapon out seems to be acceptable.
4) Initiator activates scene by interaction or walking into the designated spot. All players should be warped to the initiator and should not be stuck.
I’ve been playing with my boyfriend quite successfully like this. If I mess up the distance we both hit ‘character select’ and try once more and we’ve been having fun boss battles despite the slight nuisance.
In many scenes the game will have other party members auto-walk to the location of the initiator to fit them into the scene (There are still graphical errors sometimes haha). Perhaps this is where the bug lies.
I hope this information is helpful to anyone and that the bug gets resolved soon 

the trick will do.