Michael Mann should also revisit THE KEEP.
This seems to sum up the issues…
https://www.denofgeek.com/movies/the-disappearance-of-michael-manns-the-keep/
Bummer.
Well the alternate ending is found but the Special effects are obviously “never got done”.
So it is possible to salvage what remains to be found is if they kept the rest of the cut footage for the Keep which is unlikely.
THE KEEP has (or had?) some interesting cut scenes. The one where the old bastard (that’s tasked with watching over the Keep) is being murdered by his sons, sounds good. And the old priest, drinking blood from a slaughtered dog - oh yeah … and the rest of the Nazi carnage by Molasar.
Sadly, probably all binned?