I've found that, more than once, an error has occurred with me attempting to use the "Fill" tool while farming. Occasionally when I press this after I refill compost, I will have a popup that states that I cannot "add that amount of water at the moment" despite me 1. having enough water and, 2. the plants still needing water. This bug requires me to leave the page or refresh it to fix, which means it isn't catastrophic, but still awfully annoying.