Please see upstream bug for details: https://bugs.kde.org/show_bug.cgi?id=429967 I'm still experiencing this bug in F34 on a Thinkpad with Intel graphics with: - gwenview-20.12.2-1.fc34.x86_64 - kwin-5.21.4-1.fc34.x86_64 - mesa-libGL-21.0.2-1.fc34.x86_64 - qt5-qtbase-5.15.2-15.fc34.x86_64 obs-studio-26.1.2-3.fc34.x86_64 also shows transparent areas, not sure if same bug. Other users report that kstars has the same problem (I haven't tested). In case this bug affects all users with Intel GPUs, I think it should be considered a blocker for the Plasma Wayland by default feature.
Not reproducible on my intel-based dell latitude
I can't reproduce this either on my Slimbook with an Intel GPU.
This is caused by a bug in the OpenGL backend. It's only triggered with a non-default config: Settings -> Image View -> Animations -> OpenGL There's already an upstream fix: https://invent.kde.org/graphics/gwenview/-/commit/955df5addac77b49c8349e6477806dbf27bde238 Hence, definitely not a blocker.
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This is now fixed (at least, it's fixed in F36 for me).