I've detected it in gjiten, but later managed to reproduce it in firefox. 1. media-libs/freetype-2.1.10 media-libs/fontconfig-2.3.2 For character 部 (U+90e8). Top line in the right part of the sign disappears when size of font is between 11 and 21 (when checking integer values). I believe it's a rounding bug, cause when I played a bit with float values I discovered that for value 21.600 that part is gone, but for 21.6001 it's there. Various things that may be important: (from fc-match) for size=21.6 - pixelsize: 22.5 for size=21.6001 - pixelsize: 22.5001 for both - dpi: 75
If this is still a problem in 2.3.2 please report it upstream. Thanks. :)