Cannot use down to expand ToolStripDropDownButton in toolStrip2 after using right/Left to collapse ToolStripDropDownButton in toolStrip1

[Zheng-Li01]

.NET version

.NET SDK 10.0.100-preview2.25110.18

Did it work in .NET Framework?

No

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

Can reproduce on all previous, NET versions

Issue description

Cannot use down to expand ToolStripDropDownButton in toolStrip2 after using right/Left to collapse ToolStripDropDownButton in toolStrip1

Steps to reproduce

1. Create Winforms .NET app with 2 toolStrips
2. In these 2 toolStrips, add ToolStripDropDownButton, add toolStripMenuItem for ToolStripDropDownButton separately
3. Set these 2 toolStrips' TabStop property to True
4. Build and run app
5. Press down to expand ToolStripDropDownButton in toolStrip1 - it will focus on toolStripMenuItem
6. Press right/Left to collapse ToolStripDropDownButton in toolStrip1- it will focus on ToolStripDropDownButton
7.  Tab to toolstrip2 button
8. Press down to expand ToolStripDropDownButton in toolStrip2 -- it will focus on ToolStripDropDownButton in toolStrip1

Or using the application & repeat the steps 4~8

More info:

1. The issue also can reproduce when using Enter and right keyboard combination
   
2. The issue cannot reproduce when using Enter & Enter or Enter & Alt or Down & Alt keyboard combinations

[John-Qiao]

Verified the issue on latest .NET SDK 10.0.100-preview.3.25155.10 + private dlls built from the main branch of WinForms repo. The issue has been fixed that we can use down to expand ToolStripDropDownButton in toolStrip2 after using right/Left to collapse ToolStripDropDownButton in toolStrip1.

TestResult.mp4