SUMMARY
Some apps, since I upgraded from KDE5 (openSUSE TW snapshot 2024-03-07) to KDE6 (openSUSE TW snapshot 2024-03-29), now get minimized when switching from one Virtual Desktop to another.

I first noticed this bugs right after upgrading to KDE6, cause one of the game I was always playing now had this issue. It seem to only affect TRUE full screen mods, and not just maximized window. Whats more, not all apps are affected. Couldn't find a common denominator yet. Some are Wines apps, some are Native...

STEPS TO REPRODUCE
1. Open a true full screen apps
2. Switch from one Virtual desktop to another (Either through shortcut (CTRL + Meta + Keyboard Arrow key), through Cube, or through Meta + G

OBSERVED RESULT
After having switched to another VD, some fullscreen apps immediately get minimized. One can see that with different ways ; Either by going back to the virtual desktop with the apps, where one will notice the apps is now minimized, or by opening the Cube, where on the cube's surface where the apps was supposed to appear, its now an empty cube face with the desktop.

Here are some example of apps where bug trigger or not ;
- WoT in Lutris (Wine + Proton) : Bug happen
- Tropico 5 in steam (Linux Native) : Bug don't happen
- Stellaris in steam (Linux Native) : Bug happen
- Cities Skylines in steam (Linux Native) : Bug don't happen
- Baldure gate 3 in steam (Wine + Proton) Bug don't happen

From speaking with people on Fedora discord, someone using Arch linux was able to reproduce same bugs with a fullscreen Minecraft window... Arch linux and KDE plasma 6.0.3

EXPECTED RESULT
When switching from one Virtual desktop to another virtual desktop, apps should not get minimized.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: OpenSUSE TW, snapshot 2024-03-29, KDE plasma 6.0.3
(available in About System)
KDE Plasma Version: 6.0.3
KDE Frameworks Version: 6.0.0
Qt Version: 6.0.3

ADDITIONAL INFORMATION
- Kernel 6.8.1
- AMD GPU with opensource driver. AMD Radeon RX7900 XTX