Hexagon Flat pattern issue

Fixed — thanks for the file, Scott, it was a perfect repro. There were actually two bugs stacked here: the mitered corner between flanges on adjacent hexagon edges was leaving the two bends physically overlapping in the 3D model (the miter only handled square corners properly), and the flat pattern unfolder was choking on the leftover geometry at that corner — that's why one wall came out fine and the other collapsed into a tangle.

Both are fixed: non-square corners now get a proper miter that cuts the bends back cleanly at any angle, and the flat pattern develops both walls full-length with a clean closed outline. Your hexagon file unfolds correctly now. It'll be in the next release (v2.3.8), and your exact part is in our test suite so it stays fixed.