I did a little more testing and it seems to affect both the tank and the car for all of their respective ammo types.

My apologies, I wasn't at the PC where the save was located when I posted before.

I'm also wondering if there is still some confusion on the reproduction, as I was able to do it again just before uploading the save. I'm not opening the tank's inventory while I'm inside it, I'm opening the player ...

I'm not able to reproduce the crash using that save and the mod. I tried:

Shift click ammo in tank ammo slot
Put some ammo in the main inventory and shift click it/control click it
Control click entire inventory
Control click ammo in tank
Move all ammo to tank inventory, main inventory or drop it ...

I was able to reproduce this successfully, and I vaguely recall a similar issue in previous versions related to moving things into power armor slots by shift+clicking, maybe related?

Steps to reproduce:

Have cannon shells in inventory
Enter tank
Open inventory
Attempt to move shells into tank ...