Front dif bolt stripped

I was changing all the fluids today, and found that the fill bolt on the front dif. Is stripped.
The bad part was I drained it first, and then couldn’t get the fill bolt off.
I was finally able to remove the vent tube and fitting on the top and fill it from there.
The bolt is still in there and stripped……has anyone ran into this before?
It seems the bolt material is extremely soft.
If you have had this happen, what was the easiest way to remove it, and did you use the same factory bolt again, or switch to something else?