If you level up mastery from bonus xp, all bonus xp is lost after the match!
Two days ago, during the double xp weekend, I leveled attack heli to 49.3, the new level was entirely blue xp (bonus). Yesterday when I booted the game it was 48.7, basically all the xp from the last game that was bonus (blue, from double xp event), vanished, and it took with it the newly earned level! Attached screenshots from the initial level up to 49, and the next day when it started from 48 again.
Yesterday I leveled IFV to 50, again the entire new level was blue (bonus) xp. When I went to the main menu I couldn't equip the new skins (gold standard), even though it showed level 50 in the main menu as well. After rebooting the game it was 49, same story, the bonus xp vanished (together with the level unlock) and only the standard xp remained.
How is this possible? Why do you activate bonus xp if it is removed afterwards and our time invested in leveling up faster is basically wasted? These kind of bugs are inconceivable to me, give me back my xp!
49 level up with blue (bonus) xpNext day it was back to level 48