I've seen that effect on the greatsword textures at least 2-3 months ago, but assumed it was an issue with my installation (given I also see the Missing Texture on creatures using fire elemental models and Ki Step VFX trails).
"...I know that kind of man / It's hard to hold the hand of anyone / Who is reaching for the sky just to surrender..."– Leonard Cohen, The Stranger Song
Sorry this was missed for so long. The weapons pack was added about a year and a half ago. These seem to be some of the newer models but using the vanilla model hilts. I will revisit this when I finalize the next weapon pack which is currently in the works.