Triangular shaped "bubble"?
For my last two bakes, I've noticed an odd cavity on the outer edge of my loaves. And now seeing it back to back, I think I've seen it in some of my other loaves too. It has to be a shaping error with that triangular shape, but I can't figure out what I'm doing that would cause it. It's on the outer edge, so has to be either how I finish rolling my oblong or how I'm putting some tension in the dough after shaping.