PDF scaling is incorrect
This has been a consistent problem of 3.0 since I can remember. My specific version is 'ce77e12'.
When exporting a score into a PDF, the scaling is incorrect. This downscales many aspects such as the clefs, key/time signatures, brackets, notes, stems, etc. This also makes the stems detached from the note heads in the PDF. Obviously, all of this makes the score look wrong.
I have a PDF attached, along with the score if need be.