After killing pillager leader and picking up their banner, placing the banners in a normal chest the banners don,t always stack to a total of 16 per slot in the chest.
They seem to only stack after exiting the game and going back in. They act as being different items from "current" game session and previous game sessions.
Linked issues
duplicates 1
Comments 2
Duplicates MC-140565
I"ve noticed they stack into 9 items instead of 16 (inside and outside the chests)