I usually use APDS and HEI ammo belts for my BMPT, switching between the two pressing “1” and “2”. But after the update it just shows one ammo type “1” and I’m unable to switch to the second ammo type.
Edit: There is an accepted report for this issue that you can show your support for by clicking the “I have the same issue” button, this gives the report more visibility for the developers: ( Community Bug Reporting System )
You can bug report it here (just search a bit first so that you don’t report something that is already reported and known about): (Gaijin.net // Issues)
A guide on how to report bugs can be found here: ([Navigation] Technical Knowledge Base | War Thunder Wiki)
it seems to happen with all of the belts for the second gun