https://bugs.winehq.org/show_bug.cgi?id=56479
--- Comment #3 from solin arrin solin-arrin@protonmail.com --- yes the demo only patch is a patch for the demo(i forgot there was a demo)
demo game link: https://www.dlsite.com/maniax/work/=/product_id/RJ318368.html
the demo patch uses Dotnet 6 which does not seem to be affected by the bug