It may or may not be a bug. Something has apparently changed on the vehicle supplies -- they only re-arm now, they do not repair. It is not just your T34-76, it is all vehicles. The question though still remains if it is a new bug or was changed on purpose (by design). I did managed to pick up a box to 1/2-way repair a damaged track. I was still lopsided, but was able to drive straight and try to limp back to base.