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cb925e0259
dissolve_faces with merge_coplanar drops interior rings, so the shaft opening in a ceiling was lost and replaced by spurious wall-cap boundaries. Reconstruct the space face from its raw coplanar triangles, preserve interior rings in the assigned boundary, absorb redundant candidates by plane offset, and raise the full-face tolerance so walls offset by their half thickness get a single boundary. Generated with the assistance of an AI coding tool.