Just wanted to pop in and say I’m also experiencing this when using image wallpapers. I also have an Nvidia card. Here’s some system info:
Operating System: Fedora Linux 42
KDE Plasma Version: 6.4.4
KDE Frameworks Version: 6.17.0
Qt Version: 6.9.1
Kernel Version: 6.16.3-200.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 8 × AMD Ryzen 9 9950X3D 16-Core Processor
Memory: 64 GiB of RAM (62.3 GiB usable)
Graphics Processor: NVIDIA GeForce RTX 3080
Manufacturer: Micro-Star International Co., Ltd.
Product Name: MS-7E51
System Version: 1.0