SOLVED I wanted to make a farm using water in frontier, but I forgot that build mode prevents water flow. So I excavated all blocks I've placed plus 2 layers below and replaced everything without build protection, but water still does not flow as expected. For some reason it does not just stay, on flat surface it flows east or west in a single block thin stream of water, but it refuses to flow north or south which is the direction I want it to flow. And if I place a new water source next to the previous water source, 1 block to the north or south, it will still flow east or west from that block. EDIT I didn't know this was the way minecraft physics works. Water spreads only if you encase it, if there is a drop anywhere in the range of the water source flow, it will flow to that spot only
