A user ran 49 of their own Revit files through v0.6.1 and v0.12.0 and matched elements by Revit id. On 9 files, 665 elements that used to export as real meshes came out as 12-triangle boxes, mostly beams, plus railings, lights and doors. One light fixture went from 18,944 triangles to 12. On a 438 MB file, 73 doors were written as IfcOpeningElement instead of IfcDoor. The new version also reads 16 files the old one couldn't, and is faster. Nothing errored. You only see it if you diff the two exports element by element, which is what they did.