It doesn't change when switching between instances either. stdout is full of warnings: qrc:/qt/qml/org/kde/plasmatube/ui/components/VideoGridItem.qml:86:9: QML QQuickImage: Error decoding: https://pipedproxy.kavin.rocks/vi/NcJF-R1DGQ8/hqdefault.jpg?host=i.ytimg.com&qhash=5af0f5be&rs=AOn4CLCTBgkOkpx5A2Kwz9jSyYhVyIj6vw&sqp=-oaymwEcCNACELwBSFXyq4qpAw4IARUAAIhCGAFwAcABBg%3D%3D: Unsupported image format
Sorry this is a duplicate of https://bugs.kde.org/show_bug.cgi?id=476006, my own bug report lol. I knew I made the bug report at some point but couldn't find it any more so I wasn't sure if it still existed. Seems it does! *** This bug has been marked as a duplicate of bug 476006 ***