I tried something similar and it deleted 3 of my main guns I use
All found DLC weapons should come back when a weapon DLC is re-activated again. At least this is what I get on PC.
It took two dlc guns with the attachments and a non doc gun with the attachments and almost all of the ammo I have on me
And it didn’t give the guns and ammo back
All of the ammo was non dlc ammo besides a few rockets for the Soviet rocket launcher
I kept the stuff in my storage crate but everything I lost was in my inventory when inactivated the docs and reactivated them
That’s sad. I’m sorry for you. Usually, as Gysbert said, they aren’t removed, but just not visible or available to use.
I lost guns and it didn’t work
I am sad I lost so much ammo
I assume that there are some greater issues on your side.
Why should you lose non-dlc ammo by deactivating a dlc?
I suggest that you send your savegame file to the support. Maybe they can see something.