How to reproduce:
1. Open the attached project “IN-140808“
2. Open Build Profiles, File → Build profiles
3. Select Windows platform
4. Make sure “Scene list” contains “Scenes/SampleScene”
5. Enable “Development build”
6. Build and Run
7. Connect Pen tablet to the computer
8. Press the Pen on the top left of the tablet
9. Observe the Development console
10. Press the Pen on the middle part of the tablet
11. Observe the Development console

Actual result: The console doesn’t contain line “MouseDown: True / MouseUp: True”
Expected result: The console is supposed to contain “MouseDown: True / MouseUp: True”

Reproducible with: 6000.0.57f1, 6000.0.72f1, 6000.3.14f1, 6000.4.4f1, 6000.5.0b6, 6000.6.0a4 (77e2e2eea1be)
Not reproducible with: 6000.0.56f1

Reproducible environment: Windows 11
Not reproducible environment: macOS 26.1 (M1 Pro)

Reproducible with these devices:
Wacom Intuos CTL-4100WL pen tablet
Microsoft Surface Pro built-in pen (User reported)
Huion Inspiroy H580X external graphics tablet (User reported)
Huion Kamvas Pro 16 external graphics tablet (User reported)

Note: The results don’t have to say True next to MouseDown /MouseUp, the line just has to be there