Some chunks are not generated and looks fully black. Is it intended? (No additional mod is used).

In case they are intended: if you move to the far away from center of the map, then some chunk with resources are surrounded by such black chunks from all sides. Therefore it's impossible to use them. And probably map is finite for the player, since at some point such chunks block you in any way

This is an intended feature. Those are void chunks, meant to initially add some spatial challenges to early game, and in a future version, will have a special function for endgame.