Just discovered that I wasted a bunch of time in January 2020 reinventing a design I made up (a better version of) in October 2017.
The lavender square shows half of the pattern in its original orientation. Apparently I wove the pink one flipped horizontally, so that’s the version shown on the chart below. Now you can choose between two very similar designs. (Find the near-twin here: Kissing Triangles.)