https://bugs.winehq.org/show_bug.cgi?id=55693
--- Comment #3 from Fabian Maurer dark.shadow4@web.de --- Just to make it clear, you used that exact version I linked?
Would you mind sharing your "/usr/share/wine/mono/wine-mono-8.0.0/bin/libmono-2.0-x86_64.dll"? Last idea I have: Uninstall wine-mono and let wine download it itself.