This happens when dead zone is set to 100% or above 50% (freeaim mode) - Whenever moving upright and on tactical pace and/or ironsight mode, you get stuck on a 25 degrees arc pivot! If you walk normally or sprint (without a visible crosshair/not shouldered weapon) or crouch, you can move and turn freely. When I disable dead zone/freeaim, the bug disappears (have no pivot restrictions while walking standing and tactical pace)

The DLC weapons are 100% affected, vanilla weapons to a 75% extent and modded weapons on a lower extent (50% or less in some cases)