Ants sometimes are not seeing food bits or are having trouble to pick them up.
Moving them away from the area and then back or moving in a different group of ants (that follows a different marker) usually helps.
Simply reassigning the ants present in the area to another marker in the same area does not help, so I assume it's an issue with how the ants recognize their surrounding. It seems like the "scanning for food" process shuts off and only reactivates once the ants have left the area and then re-enter it again, so that a new scanning process is initiated.
Moving them away from the area and then back or moving in a different group of ants (that follows a different marker) usually helps.
Simply reassigning the ants present in the area to another marker in the same area does not help, so I assume it's an issue with how the ants recognize their surrounding. It seems like the "scanning for food" process shuts off and only reactivates once the ants have left the area and then re-enter it again, so that a new scanning process is initiated.