Not a big deal, but gonna make note of it anyways.
I have noticed that if I fill compost and then try and fill water before the compost bar is shown as filled/the fill animation isn't completed, the water bar will not show as filled after that click, and if I click it again I get an error saying that I can't add more water. It'll show as filled upon refresh, so it still successfully fills the water, just doesn't show.