Further info. At least for me, this appears to be an issue with FSDreamTeam sceneries being the destination. It happens with both KORD and LSZH. Interestingly, there’s a thread on the iniBuilds forum stating that this issue can occur in a scenery with a custom ILS. That said, I’m pretty sure this is an issue for iniBuilds/Asobo to fix, and not for FSDreamTeam to fix. This CTD behavior is not happening with any other aircraft utilizing a nav database, including the FBW A32nx or the Fenix A320.
https://forum.inibuilds.com/topic/6000-ctds-when-entering-information-into-fmc/