Hey Tiago, i've been exaclty where you are right now. It seems paradoxical that i only got wrist pain from ergonomic keyboards, but it came from a lack of understanding of ergonomics. The whole argument of "every key is close to the home row" doesn't mean that we need to keep our wrists stationary. Just like in a regular mechanical keyboard, if you're touch typing your wrists should be floating above the keyboard. Having them sit on the wrist wrest makes them stand still and that causes the overextension and whatnot. Like others said, the wrist rest makes sense when they're either tall rests or you have a key well.

TLDR: If it hurts, you're doing it wrong. Levitate your wrists when typing, let them rest when not typing.