SUMMARY
In case of Folder View Layout the content of the set Custom Folder does not show up on the desktop screen after another Activity's one is set

STEPS TO REPRODUCE
1. Open [Configure Desktop and Wallpaper...] by a right mouse click on the Desktop
2. Set Wallpaper >> Layout: Folder View
3. Set Location >> Show: Custom location and select a folder (let's say folder A) for the current Activity (let's say Activity A). Now its content is visible on the desktop screen
4. Close configuration
5. Change Activity (let's say to Activity B) and configure it in the same way, but assign another Custom location to it (let's say folder B). Now its content is visible on the desktop screen.
6. Change Activity back to A. Now the content of folder A does not show up on its desktop screen. Though the A assignment is still valid.

OBSERVED RESULT
The content of a previously selected custom location (after another Activity's one is set) do not show up on its desktop screen, however the selection is valid. E.g. a new file can not be created on the desktop with a name of an existing's file name in its assigned folder. 

EXPECTED RESULT
Custom location of every Activity should always be shown on its own desktop screen. 

SOFTWARE/OS VERSIONS
Linux/KDE Plasma:  MANJARO (64-bit)
KDE Plasma Version: 5.23.4
KDE Frameworks Version: 5.88.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION
Kernel: Linux 5.15.6-2-MANJARO
HARDWARE
Architecture: x86-64
Hardware Vendor: Acer
Hardware Model: Aspire V3-372
Processors: 4 x Intel Core i5-6200U CPU 0 2.30GHZ
Memories: 7,7 GiB RAM
Graphical processor: Mesa Intel HD Graphics 520
Display controller: Skylake GT2 [HD Graphics 520] (Intel Corporation)