Not sure if this is the right place for it, but I feel like this is where people go when they have problems, so putting solutions here seems natural.
Press ~ to open the console and type 'Iroll20s' to enable cheats.
Press ~ again and type 'removestatuseffect <character> Fractured_Bullet_SE_ProjectileMultX3'
Press ~ and type 'Iroll20s' to disable cheats.
For <character>, the PC is 'Player_<YOURNAME>'. Not sure about companions. Try their name, or 'Companion_<NAME>'. So for Xoti, 'Companion_Xoti'.
You might have to use Fractured_Bullet_SE_ProjectileMultX2 instead, but X3 is what did it for me.
Fair warning, this will probably disable achievements for that save game..Anyways, that fix worked for me. A temporary fix until it's patched. Don't equip Eccea's (Cursed) Arcane Blaster again until it's fixed. If you accidentally do, you know how to fix it now.
Edited by sortajan, 20 May 2018 - 11:09 AM.