Deployment of a Qt app

[IlyaBizyaev]

Hello! :)
Reporting a problem that may be either a build problem here or an upstream bug.
I built my Qt app with MinGW & MSYS, it works fine. I collected all of its dependencies (dlls) to the executable folder to make a distributable bundle (using a script and winqtdeploy), but the app simply didn't launch (no errors, no output). Took me ages to figure out that the problem was the Qt5Core.dll patched by winqtdeploy. Still don't know what the patch is specifically, but if I replace this dll with the one from mingw64/bin, the app works.