Weapons (ranged and melee) becomes invisible with Saltzpyre (done with bounty hunter several map in a row). I believe it is because of the reload of volley crossbow (and I had rapiere as melee). They became visible again when interacting with something (pulling up someone, picking up ammo). Both skin are the red ones for each weapon (Truthsnare and The Judge’s Mark). Died the first time that happend, finished the second and had a backend error at the end portal of the third game.
Not sure if the images uploaded correctly, can provide a few more eventualy. Hope it helps.