Arsenal Mastery Assault Rifle Not Appearing in Hands When Sheathed

[LAJ199]

The assault rifle for Arsenal Mastery on my DP/Nin/Ar Blaster works fine when unsheathed is selected in the costume editor. When it's sheathed, however, the rifle remains on my character's back at all times. It does not appear in my character's hands when idle, running, or firing LRM rocket. The character uses all the correct animations (i.e. appears to hold the AR in his hands when idling, running, or firing LRM), but the rifle itself stays on his back. Anyone else encountered this? Apologies if this is a known bug!

[ZorkNemesis]

Been reported a few times that some sheathed weapons don't seem to function properly when combined with others, notable Assault Rifles and Dual Pistols.  Left-handed weapons seem to be a factor, but I recall hearing part of this issue stems from Blasters being able to carry more weapons than any other AT at once.