I had it happen with the pattern for a self-paced virtual skills class led by a rather well-known designer. There were a number of different blocks, each focused on a different skill (scant 1/4" seam, curved piecing, HSTs, flying geese, FPP, etc.) Several of the blocks had completely wrong cutting measurements. A number of us pointed out the issues as we found them, but the designer never acknowledged them nor fixed the instruction documents. She'd respond if you posted favorably about the course, but ignored any comments pointing out the errors. I followed the class FB group for months and saw new members posting about these same pattern errors. It was a fairly expensive class, close to $200 not including fabric. It turned me off completely to any of that designer's patterns (and classes.)