Hi
I made a video investigating some of the major bugs with Halo 3 MCC forge. The bugs are easily reproducible with regards to object rotation when saving maps and shown in this video. Hopefully 343 can fix these issues soon as it would make map building significantly better
Make sure and file a bug report about this on the Halo Support site: https://aka.ms/HaloSupport
Be sure to read over the known issues list first before reporting and submit 1 issue per bug report you open 
I don’t know if this is still in mcc but in one of the guardian towers in sand box for halo 3 there’s a disturbing face is it a bug
Please don’t revive old topics thanks and see my post above for submitting bug reports