Problem with russian text and opensans

Putzar, Robin Robin.Putzar at
Tue Apr 30 15:58:36 CEST 2024


I recently upgraded to TexLive 2024 and now have a problem compiling documents with Russian text with opensans. A minimum working example:

Test \foreignlanguage{russian}{тест}

When compiling this with LuaLaTeX, I receive the following error in the line with \foreignlanguage:

Illegal parameter number in definition of \l__exp_internal_tl.

I remember that with TexLive 2023 there was no such error. I can ignore this, and the output looks fine. However, this is kind of annoying, and I'd like to know how to avoid this error. Any help is greatly appreciated. Thanks!

Best regards
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