SUMMARY
Pen cursor controls other screen for about 2-4 sec despite cursor being clearly on the new screen, 
Tablet setting is set to Specific Screen, cursor is visible on the Main Screen selected as Specific Screen. 
Yet it still controls the other screen for about 2-4 second. A stylus tap was performed to confirm the screen to which its transferred despite that it still control the other screen . I think there is a delay of transfer of control. 

STEPS TO REPRODUCE
1. Have Multiple Monitor
2. Drawing Tablet setting set To specific Screen - set the other screen as the main tablet screen
4. Set one of the button to me a middle click [for the scroll] 
3. Open a browser that clearly has scroll bar on the Other/ Not Main Screen
4. Browse a little bit on the other screen 
5. Jump to the new screen, click tap, then click the button mapped to middle mouse 


OBSERVED RESULT
The browser on the other monitor , scrolls up and down despite the cursor being in other screen and even tapping it to ensure it register in that screen. This happens for like 2 or 3 taps before it fully transfer control to the main tablet screen. 

EXPECTED RESULT
The moment you switch to the new screen and click the window/ tap on the screen with the pen it should register that screen as the active screen. Stylus should not be able to control the browser scroll/ whatever was on the other screen. 

I tested it on file browser and there is that delay of transfer there too. It just more visible when its on a browser since the scroll is getting activated before it transfer to control to the other screen. It delay is significant enough to be noticeable like i think 2-4s. Annoying when you are drawing. 

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: Fedora 42
KDE Plasma Version: 6.4.4 
KDE Frameworks Version: 6.17.0 
Qt Version: 6.9.1

ADDITIONAL INFORMATION
Tablet: Huion Kamvas 22+ with Slim Pen