Only defined SystemDefaultEUDCFont appears to be getting used, even when EUDC for a specific font has been defined

According to usage, we should be able to define different EUDC characters to specific fonts.

For example, here is an appropriately configured set of EUDC fonts:

This is showing specific EUDC files to use for different fonts.

The expectation is that when using font family MS Gothic, QT should attempt to use C:\EUDC\FEJPGOT.TTE for characters that are missing in the MS Gothic mapping.  This works in various other browsers (such as MS Edge).

The actual result using QT is that it uses whatever is registered as the SystemDefaultEUDCFont no matter which font is actually being used.  In the case above, the characters defined in C:\EUDC\FEJPMIN.TTE will be used in the case there characters are missing from MS Gothic.

Thank you!