DumpContainer.Dump() with DumpOptions has stopped working

In the latest version of LPQ9 9.7.5, when setting DumpContainer.Dump() with DumpOptions, number formatting does not work if the DumpContainer.Content property is set. (It worked in previous versions and also in LPQ8)

Code to reproduce the issue

DumpContainer dc = new DumpContainer(); 
DumpOptions dopt = new DumpOptions()
{
    FormatStrings = new DumpFormatStrings
    {
        IntegralNumber = DumpFormatStrings.Constants.IntegralNumberWithGroupSeparator,
        RealNumber = DumpFormatStrings.Constants.RealNumberWithGroupSeparator
    }
};

dc.Dump(dopt);
dc.Content = new { a = 123456789.01, b = 123456789, c = "abcdef"};

LPQ9 v9.7.5

LPQ8