That's interesting and a bummer that the KB doesn't say why or what to do for correction.
I'm looking around more for additional details as I plan to take one of my labs up to Win10 2004 and this could impact it's success.
As the KB says, it seems to be a limitation of Windows 10 version 2004 as Remote Desktop. I wonder if Microsoft has removed some feature of the OS in version 2004.
Microsoft has released an update (KB4598291) which contains fix for the issue. This fix is publicly available through Windows Update as well as WU catalog from https://www.catalog.update.microsoft.com/Search.aspx?q=KB4598291