Original text box is not empty after drag and drop the value to a new text box

[Liv-Goh]

.NET version

.NET 10.0.100- preview.5.25270.108

Did it work in .NET Framework?

Yes

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

Yes, this issue is regressed from PR: Allow IDataObjectAsyncCapability by JeremyKuhne · Pull Request #13431 · dotnet/winforms

Issue description

After drag and drop text from one control to another, the original one should be empty

Current behavior
The original text box is not empty

Expected behavior
The original text box is empty

Steps to reproduce

Please download, unzip and run this sample project to test the issue.
DragDropMoveSample.zip

[Olina-Zhang]

Verified in the latest .NET 10 SDK build: 10.0.100-preview.6.25278.103 + private binaries built from main branch of Winforms repo, it was fixed:

GH13508Verify.mp4

[Zheng-Li01]

Verified the issue with .NET SDK 10.0.100-preview.6.25321.102 test pass build, it was fixed that have same result as above.