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warning: no font for Geometric Shapes character U+25AA, fallback to '?'

Babelfish
With Prince 13 I have a problem with custom fonts. I use the font file WayfindingSansRg-Regular.ttf in a list. My CSS for the list is:

li {
  font-family: "Wayfinding Sans", Arial, serif;
  list-style-type: square;
}


But I get this error while generating the pdf:

prince: loading font: …/WayfindingSansRg-Regular.ttf
prince: used font: Wayfinding Sans Rg, Regular
prince: loading hyphenation patterns: /…/usr/prince/prince-engine/style/../hyph/hyph-de-1996.pat
prince: page 1: warning: no font for Geometric Shapes character U+25AA, fallback to '?'


Any idea, why the missing character U+25AA is not take from a default serif font?
Babelfish
I've found the problem, the AWS Lambda package cause the wrong character.

See my other question: https://www.princexml.com/forum/topic/4515/error-while-loading-shared-libraries-libgomp.so.1

With the Generic Linux oder macOS version it's fine.