Ironically I think this is the correct behaviour and the bug is that it doesn’t always cut off heh.
Certainly you are not supposed to use it below 400ft or below minimums, as per the POH but I don’t know if the real plane actually prevents activation or auto disengages below these limits.
In any case this isn’t an auto land plane so “suck it up” and fly those last 400 feet lol. This is such a well behaved plane, even I, someone who loves to let planes get almost onto the runway with AP, have no problem landing by hand. Beautiful plane.