Clipboard behaves different between net8 and net9

[InlineAsm]

.NET version

net9.0-windows

Did it work in .NET Framework?

Yes

Did it work in any of the earlier releases of .NET Core or .NET 5+?

It does work on net8.0

Issue description

The Clipboard method ContainsText returns false when a string is placed on the clipboard using SetDataObject. In previous versions of the runtime this method would return true.

Steps to reproduce

The following code returns true on net8.0 and returns false on net9.0

Clipboard.SetDataObject("TEXT");
var containsText = Clipboard.ContainsText();

[lonitra]

@LeafShi1 could your team take an initial look? My initial thought is perhaps we had accidentally changed something in Clipboard.ContainsText between .NET 8/9 - perhaps some sort of typo.

The codepath for Clipboard.ContainsText should eventually call IDataObject.GetDataPresent, which should go to our DataStore.GetDataPresent. where it should check to see if the format is there - though it is possible on .NET 8 that this goes to a different implementation we have of IDataObject.GetDataPresent. We should compare what the difference is between the codepath for .NET 8/9