SUMMARY
I have configured a scale of 125%. It works both in Wayland and X11, but when switching from one session to the other, the setting is not used and screen is back to 100%.

The value in the settings keep showing 125% but is not true. The only way to fix it, is move it to a different value, save, and then change it back to 125%.


STEPS TO REPRODUCE
1. Start Wayland session
2. Configure the display scale to 125%
3. Log out
4. Start X11 session
5. Log out
6. Start Wayland session

OBSERVED RESULT
Wayland uses 100% scaling, but it shows 125% in the settings.

EXPECTED RESULT
Scaling settings should work even when switching between different sessions.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.25.4
KDE Frameworks Version: 5.97.0
Qt Version: 5.15.5
Kernel Version: 5.19.2-arch1-2 (64-bit)
Graphics Platform: Wayland
Processors: 8 × 11th Gen Intel® Core™ i5-1135G7 @ 2.40GHz
Memory: 15.4 GiB of RAM
Graphics Processor: Mesa Intel® Xe Graphics
Manufacturer: LENOVO
Product Name: 20XYCTO1WW
System Version: ThinkPad X1 Yoga Gen 6

ADDITIONAL INFORMATION
Thank you so much for all the improvements regarding Wayland. I have been using Wayland for almost have a year now and it's a great experience, specially with a touchscreen. I only have to switch back to X11 once in a while to run some things with Matlab (which crashes and freezes continuously with Wayland).