Same experience, unfortunately :/
Hardware CPU/GPU: AMD Ryzen 7950X + RX 6800XT (computationally, very capable setup)
Ubuntu 22.04 - no issues on DisplayLink 5.6 (I think it was the version installed)
Ubuntu 24.04 - DisplayLink 6.1, awful horizontal artefacts appear like when I had (in the past) very low performance graphics card installed
Artefacts are particularly visible when moving around browser window with a white page over non-white.
I remember such experience having those artefacts when had different, much less capable graphics card - Radeon Pro WX 2100
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