Right now the bots just hover in place indefinitely when they have nowhere to put the mined ore (chests full). Mining should not be initiated when there is not enough free space in logistic storage.
Unfortunately there's no easy way to check if storage is available without completely killing UPS. Additionally, this is not how the rest of the game works; if you deconstruct too many trees/buildings with no space to store the items the bots will hover in place.
