The reported problem is not visible (at least not much) on Debian 10. A short investigation suggests it may be a matter of TTF bytecode interpreter version in the freetype library.
Apparently in Debian 9, the default version was v35, which when selected in Debian 10 by setting envitonment variable FREETYPE_PROPERTIES="truetype:interpreter-version=35" makes the problem visible again. I will try to choose higher version on a Stretch machine. -- Było mi bardzo miło. --- Rurku. --- ... >Łukasz< --- To dobrze, że mnie słuchasz.
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