It doesn’t happen every game but a lot of games (it happened to me in 2 games already, both times on Underground Stopwatch if that matters) there’s this bug which does not give you gamemode xp for planting a C4 and not when it detonates.
I planted C4 on both generators (should’ve gotten 200xp for that) and they both exploded (so another 600xp) but when I looked in the scoreboard I noticed I had only like 200 something xp which I got for kills.
I also planted the bomb in the primary objective and it even said on top “Frosty planted C4” but I got no xp for it. I didn’t get the 1000xp after it detonated either
I don’t really care about xp that much but when you have a mission to get 6,000 gamemode xp it’s really difficult to complete it with this bug. I hope you can fix it in the 2nd part of Summer Squash