Open an applet in krunner such that it shows in its own window. Shrink the window by resizing until it is <10 pixels wide. Now not even the close, minimize, etc. buttons are visible anymore, let alone the window contents. This shouldn't be possible, there should be a reasonable minimum size set for the window.
indeed, the Layout attached property isn't getting propagated, because the applet graphics item isn't parented to something created with QML
resolved by https://commits.kde.org/plasma-workspace/e20f155190ac4e47bd2a9c1967b79f6e125c95ec