I have been playing several matches in AB. In one of them I got 3k research points, but only progressed my BTR-152D research by 152? I am grinding with 9.7-10.0 BR USSR vehicles and the same issue is replicated in US too. Am I doing something wrong?
The research of those vehicles is impossible and I can only progress with bonus researches.
I was able to fix this issue by removing the BTR from research and enable research for it again. After a match I got 3k research points of progress. It looks like War thunder ate all of my progress of this day.