SUMMARY When using a Text brush tip, the chosen font size does not affect the brush tip. The font itself does change, just not the size. It works fine in 5.1.x, but not in 5.20-rc1 or master (git a763fc6). STEPS TO REPRODUCE 1. Choose a brush like "b) Basic-2 Opacity" and set the brush tip from "Auto" to "Font" 2. Change the font size e.g. to 40 and paint a dab OBSERVED RESULT The brush still paints with the original 9pt font size.
The bug is fixed in https://invent.kde.org/graphics/krita/-/commit/6adf58808edb9de6b1ecc094c0d82c9df07b26f8