Round in chamber disappears during blowout panel ammo rack

I have noticed recently after grinding top tier America, when someone hits solely your blowout panel it also removes the shell that was already loaded in the breech. This only leaves you with one or two HEATFS rounds if you are using those as a backup. I understand you loose all shells in the blowout rack but how does it also destroy the shell in the breech that is in the crew compartment, causing a reload. Maybe I’m crazy but I have noticed it happening more often.

Note: Current vehicles I am using; M1A2SEPV2, M1A2, M1A1AIM, M1A1HC.