The Custom Bug starts after a number of turns, depending on the Bug level, and reduces the amount of available chip slots in the Custom Screen by 1 every time the Custom Screen is opened.
The bug takes effect depending on Bug level:
Level 1: Fourth turn onward. Level 2: Third turn onward. Level 3: Second turn onward.
Notes
Custom Bug will not decrease the available chip slots below 2. Charge Cross can stall the chip decrease by 3 turns. Chip Icon 6 Giga 004 Falzar.png HubBatc can be used to stall out Custom Bug for several additional turns by resetting the custom size to the maximum possible.
Navi Cust parts causing the Bug
Custom 1, Custom 2, Mega Folder 1, Mega Folder 2, Giga Folder 1, Folder Pack 1, Folder Pack 2, Chip Shuffle, Number Open
Patch Cards causing this bug