This issue IS NOT SOLVED. I lost hundreds of Boosters, got 10 back which is nothing compared to what I collected over the years. The last update made the game so much worse, it‘s really a pity.
Hate this feature. I lost all my boosters after the last update, this companion update is also making the game more difficult and there are no more events to gain more boosters. Since the last update everything has gotten worse. Seriously considering quitting the game altogether.