Had time to look more into this today as im curious if im just doing something wrong or this is a bug. I was able to duplicate this on my end by using a real world flight pulled from flightaware for a flight from KEWR-KSFO for UAL 202. (Keep in mind I am in no way an expert on the A320 or MCDU)
Routing: NEWEL J60 DANNR J60 DJB KC69Q CABIJ KG75I NELIC KP78E LESNR KD81W KD81U IDECA KU75O PARZZ Q138 FIMUV LEGGS BDEGA3
To duplicate, I emptied my community folder started a flight at KEWR at the gate cold and dark using default a320neo. No flight plan pre-loaded. powered up the plane and started programing the MCDU. I did the following steps:
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On the INIT page entered FROM/TO, FLT#, CI, and ALT.
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Moved onto the F-PLN page to enter departure and routing. I was able to add a departure from 22L and first direct to NEWEL. From the airways page added J60 to DANNR.
But could not add another airway J60 to DJB. Also could not add NEWEL-J60-DJB.
However, when I went back and did DANNR direct/to DJB it auto inserted the airway between the two point.
Hope this helps in determining if this is a bug. Let me know if I can provide any more detail.