Go to the BP_MasterThrowable and create a new variable called QuickSlotIndex and set it to a Integer.
Add the highlighted nodes shown in the image below, location at the top of the image.
SGK V2 – Fixed throw able quick slot icon not updating
Go to the BP_MasterThrowable and create a new variable called QuickSlotIndex and set it to a Integer.
Add the highlighted nodes shown in the image below, location at the top of the image.
Defuse Studios 