• .NET Core Version:

.NET Core 5.0
Version: 5.0.100-alpha.1.20073.10
Commit: 29f4d693a9
Runtime Environment:
OS Name: Windows
OS Version: 10.0.18363
OS Platform: Windows
RID: win10-x64
Base Path: C:\Program Files\dotnet\sdk\5.0.100-alpha1-05536
Host (useful for support):
Version: 5.0.0-alpha.1.20072.3
Commit: c3dc1fdfdc

• Have you experienced this same bug with .NET Framework?:

Yes

Problem description:

Accessibility providers:
"[pid:8180,providerId:0x80ACA Main:Nested [pid:9640,providerId:0x80ACA Main(parent link):Microsoft: MSAA Proxy (unmanaged:UIAutomationCore.dll)]; Hwnd(parent link):Microsoft: HWND Proxy (unmanaged:uiautomationcore.dll)]"

Expected behavior:
Splitter control accessibility should support UIA providers.

Minimal repro:
Create WinForms app with Splitte control and analyze it using Inspect.

Related item:
This work item is the sub of #2164