This was most likely a glitch in FS2020 as has been reported in many Aircraft. You seem to have nailed the flight plan correctly. Most of the discontinuities get created after you load the STARs and the SIDs and don’t correctly select the transitions. From what you describe, LLTCH was a direct but make sure you check any constraints (altitude/speed) that accompany the waypoint or airway and those are programmed in correctly before you start your flight. Finally, always verify your flight path on the MFD and make sure the path looks correct (which sounds like you did). Did you try flying this again to see if it happens again?
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