Platform-specific arguments do not parse a comma-separated list

The QGuiApplication documentations states:

You can specify platform-specific arguments for the -platform option. Place them after the platform plugin name following a colon as a comma-separated list. For example, -platform windows:dialogs=xp,fontengine=freetype.

When supplying such arguments, only the first entry in the comma-separated list is actually parsed. The rest are ignored.

I detected this by running an application with -platform windows:dpiawareness=1,fontengine=freetype and found that the FreeType font engine was not being used.