https://bugs.kde.org/show_bug.cgi?id=439691
--- Comment #4 from Andrei Rybak ---
After some experimentation, it seems to be related to "Edit Panel > More
Options > Opacity".
- The steps to reproduce described above have a prerequisite -- use the
"Adaptive" value for this setting.
- With
https://bugs.kde.org/show_bug.cgi?id=439691
--- Comment #3 from Andrei Rybak ---
Created attachment 139974
--> https://bugs.kde.org/attachment.cgi?id=139974=edit
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https://bugs.kde.org/show_bug.cgi?id=439691
--- Comment #2 from Andrei Rybak ---
Created attachment 139973
--> https://bugs.kde.org/attachment.cgi?id=139973=edit
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https://bugs.kde.org/show_bug.cgi?id=439691
--- Comment #1 from Andrei Rybak ---
Created attachment 139972
--> https://bugs.kde.org/attachment.cgi?id=139972=edit
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