The Sepfahn bugs have been an issue since April of 2018 and has had dozens of threads with evidence. The Venka Prime bug started as a result of melee 2.9 in which bugs are to be expected. Venka Prime is still bugged after leaving the esc menu. Hopefully these get addressed soon.
The screenshots are pretty self explanatory.
Visible while holstered is toggled off on the Sepfahn Zaw and the scabbard clearly doesn't go away and even doubles when holding the weapon.
Then you have the do