No, I just fell ill and am lagging behind in responding to messages. Also, even when not sick I do still have “only” two days per week for Tiled stuff, so a reply can always take a few days.
Actually I’m a little surprised by your question, since this is supposed to just work. It may be that you have found a bug, but I can’t reproduce it. If I use the Wang Brush on the
isometric_grass_and_water.tmx map, I can definitely see it picking randomly between the two available variations for the straight edges.
The probability of choosing one variation over another can be configured per Wang color and per tile. By default this probability is 1, which should give all tiles the same chance to appear. You did not somehow by accident put it on 0 for your tiles or Wang colors?
Which version of Tiled are you using exactly and maybe you could upload a zip of your assets. When the example map works but somehow your own assets do not, then they may help me reproduce the issue.