Weapons not appearing in 'Presets' lists

The problem is the following weapons are not available when clicking the 'Presets' button:

- MK18 rifle

- Saiga-9 carbine

- STM-9 carbine

- PL-15 pistol

- M45A1 pistol

I identified pretty much all objects / weapons/ addons in the game, so that's not the problem. I can buy these weapons from flea market / traders, but even after they are in my inventory they are not available in the 'Presets' weapon lists. It's not a huge problem, but it bugs me. In a different profile i had, the Saiga and MK18 were available, but the others not.

Later edit :

I changed all the items to be identified by default it the server items database, switching "ExaminedByDefault": false to "ExaminedByDefault": true for everything.

This partially solved the problem and made the MK18, Saiga-9 and M45A1 visible in 'Presets'.

However, PL15 and STM-9 are still not available.