Ceiling Joist Edge Cut
In the picture above the ceiling joist are cut at
45° angles and do not provide as much structural support as they would
have, if they were not cut.
You can see that there was no need to cut the ceiling joist, because they butt into a gable wall end. If the ceiling joist were running in the opposite direction, they might have needed this cut, so they would not affect the roof sheeting.
This is a common practice used during home construction.
This cut is a little too big for normal construction and should not have been cut more than one quarter of the thickness, of the ceiling joist.
There is very little you can do about this and there will probably never be a problem as a result of the cuts. I have personally never ran into a situation where the ceiling joist where cut like this and needed to be replaced, for what ever reason, during my remodeling career.
However I have seen building inspectors and structural engineers make contractors replace mistakes like this, because they don't meet local building codes or structural building requirements.
You can simply write this up on your home inspection report as needed.