Hey,
We are aware of this issue and our teams are looking into it.
Some players have figured a work-around, if at all possible, please feel free to share that with players until we work on a fix.
Thank you
This thread was added on April 22, 2020, with posts from UbiT00n.
Original Post
FYI: Don't do in Heroic Coney Island Ballpark Mission because is still bugged. The only way to advance is doing the mission in Challenging and killing yourself to restart the last point and the door will be open.
Massive :facepalm: