Defect - Luban doesn't size text correctly

Note the difference in size in this screenshot…

Note that Luban reports this as 12pt…

And this as 12pt

Luban 4.10.2

Because your bounding box is too small.

Resizing the bounding box resizes the text, so I can’t make it too small.

If resizing the bounding box was independent of the text size then I’d have control over justification.