Normally, as was before the major update, when you had damaged an enemy aircraft (for example put them into a flat spin without actually killing them) and they crashed into the ground you get the normal full kill. Now, sometimes when this happens (I’m not sure if its everytime or not) you’ll only get the half reward “aircraft crashed”, when you should get the full kill reward “aicraft destroyed”. This can be fixed by making so that if a player is damaged by another player, the aircraft crashed award cannot be given at all and if they crash then the player that damaged them gets the full kill, like it always has been.
You can bug report it here: Gaijin.net // Issues (just search a bit first so that you don’t report something that is already reported and known about)
A guide on how to report bugs can be found here: ([Navigation] Technical Knowledge Base | War Thunder Wiki)