This doesn’t connect properly because the parking spot is too far from the maximum length of the jetway. It’s a common occurence among auto-gen airports where the placement of the parking spot and the jetway attachment to the building may be too far apart. The jetway has a maximum length that it can extend, if it’s reached it’s maximum extension, it will stop and place the covers as if the plane’s there.
Scanning through the airport and looking at other gates to see which one has a closer jetway could be a good workaround. And just switch to that gate.