In 2 separate cases in MSFS 2020 , messing with the BEBUS waypoint in tyhe PMDG FMC froze the whole MSFS.
RUSO2W arrival for VOR DME Z RWY 11 (BEBUS)
1st case: I successfully added the procedures from my arrival airport early in flight. Everything went well. During the RUSOS2W STAR i tried to remove the hold from the BEBUS fix and the machine froze.
2nd case: While enroute i tried adding the STAR and Approach and the machine froze when i selected BEBUS in the DEP/ARR page.
In both cases the aircraft was PMDG 738.