[Accessibility][HC] The color of the inverted triangle symbol of "Details" button in Properties window is incorrect when non-selecting it

[MelonWang1]

.NET version

.NET SDK 7.0.100-rc.2.22417.1

Did it work in .NET Framework?

No

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

No, it's not a regression issue, also repro on .NET 6.0.

Issue description

Current Behavior: The inverted triangle symbol of "Details" button is invisible when non-selecting it.

Expected Behavior: The inverted triangle symbol of "Details" button should be visible when non-selecting it. More Info:

1. This issue is repro on theme is HC1/2/Black.
2. This issue is not repro on theme White.

Steps to reproduce

1. Create a WinForms .NET core project
2. Change the Form's Name properties to ";"
3. Now "Properties Window" will pop up
4. Observe the inverted triangle symbol of "Details" button