Yeah on the dev branch they changed the optic entirely. the MOS is basically a new optic with the SOS's old model and the SOS is no longer there. when the added the Rahim that also added the LRPS that uses the same optic model the SOS had minus the SOS's alternate top sight. So on the dev branch its the LRPS also had the same issue when I tried it.

That is the in game armory and inventory name listed by SOS and optic_SOS on
https://community.bistudio.com/wiki/Arma_3_CfgWeapons_Items

The LRPS ( optic_LRPS ) on the same list also presents with the issue

No mods used in the test environment just the Projectile Path Tracing script