I can't explain why, but apparently very few seem to be affected? That will be the reason why this bug is not a priority. The forums should be flooded with reports of this bug because it occurs on every flight (when one of the many problematic approaches is used), but the forums are empty. Is it just that almost nobody flies the Inibuilds planes or why aren't more people complaining?
My current list of crashing ILS-approaches:
LSZH ILS28 / ILS34
LSFB ILS33
EGCC ILS05R
OBBI ILS30R
GMMN ILS17R
Feel free to report other approaches that result in an WASM crash when selecting in the MCDU, then we don't have to learn the hard way. My solution is to check all ILS approaches when I fly into a new airport. The other alternative would be to buy the Fenix airplanes and avoid Inibuilds, unfortunately I can't afford it at the moment.