https://bugs.winehq.org/show_bug.cgi?id=53155
--- Comment #5 from Michal Suchanek hramrach@gmail.com --- Thanks for the summary.
None of these bugs names msys2 so it's difficult to make the connection - except the last one which was staging-only back then, has nothing actionable, and now the installer fails even without staging patches.
With the patches applied I cannot run wine at all, even wineboot -u hangs. That's as far is git gets for now.