https://bugs.kde.org/show_bug.cgi?id=447388

--- Comment #7 from Michal Ziabkowski <mz...@o2.pl> ---
Okay, I've finally found some time for some more extensive testing. Sorry it
took so long.

To remove some variables out of the equation, I purged my appletsrc, changed
the wallpapers for both my activities (I have two with different wallpapers)
and rebooted a few times.

I can attach the config file, but I believe the changes between runs are more
interesting:

After the first reboot, the path to the wallpaper changes and a new containment
is added:

@@ -22,7 +22,7 @@
 DialogWidth=800

 [Containments][1][Wallpaper][org.kde.image][General]
-Image=/usr/share/wallpapers/SafeLanding/
+Image=file:///usr/share/wallpapers/SafeLanding/contents/images/5120x2880.jpg
 SlidePaths=/home/mziab/.local/share/wallpapers,/usr/share/wallpapers

 [Containments][2]
@@ -92,6 +92,20 @@
 Image=/usr/share/wallpapers/OneStandsOut/
 SlidePaths=/home/mziab/.local/share/wallpapers,/usr/share/wallpapers

+[Containments][25]
+ItemGeometries-1920x1080=
+ItemGeometriesHorizontal=
+activityId=c850a35c-21b5-4a3d-a501-e439889d7d98
+formfactor=0
+immutability=1
+lastScreen=2
+location=0
+plugin=org.kde.plasma.folder
+wallpaperplugin=org.kde.image
+
+[Containments][25][Wallpaper][org.kde.image][General]
+Image=file:///usr/share/wallpapers/Next/contents/images/1920x1080.png
+
 [Containments][8]
 activityId=
 formfactor=2

On the next reboot, the wallpaper path changes again, for the other activity,
it seems:

@@ -89,7 +89,7 @@
 DialogWidth=800

 [Containments][24][Wallpaper][org.kde.image][General]
-Image=/usr/share/wallpapers/OneStandsOut/
+Image=file:///usr/share/wallpapers/OneStandsOut/contents/images/1920x1080.jpg
 SlidePaths=/home/mziab/.local/share/wallpapers,/usr/share/wallpapers

 [Containments][25]

Then it changes again on the next reboot:

@@ -89,7 +89,7 @@
 DialogWidth=800

 [Containments][24][Wallpaper][org.kde.image][General]
-Image=file:///usr/share/wallpapers/OneStandsOut/contents/images/1920x1080.jpg
+Image=file:///usr/share/wallpapers/OneStandsOut/contents/images/2560x1600.jpg
 SlidePaths=/home/mziab/.local/share/wallpapers,/usr/share/wallpapers

 [Containments][25]

As a reminder, this is an X11 install with two screens, a 1080p one and a 4k
one. The latter is set to clone the first one (without scaling) for
convenience. It's possible that there are TWO bugs at play here. The changing
wallpaper paths might also warrant some scrutiny, but the bug happens with my
own wallpapers with no multiple versions for different resolutions, so it's
likely not the main culprit.

I have conclusive evidence that disconnecting the TV works around the bug.
After doing that I couldn't reproduce it, the proper wallpaper appeared
instantly. With the TV plugged in, the wallpaper would change to the proper one
after 40 or so seconds.

So if this is hard to read. I can post more info, just tell me what you need.
Please note that this is still on Plasma 5.23, but as I mentioned in a previous
comment, I got the exact same bug on Plasma 5.23.90, so whatever causes it
isn't yet fixed.

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