USB-C : Lower image quality when in 144Hz

Hello!

I’m using a 2021 Apple Silicon MacBook Pro on Monterey, connected via USB-C to the 144Hz 4K Eve Spectrum. It’s currently running firmware 105.

When switching to 144Hz, the image quality decreases noticeably: color slightly bleeds, especially around very colored icons, or colored text.
When enabling HDR on top of 144Hz, the issue gets much more visible.

Is this expected? Is this chroma subsampling, or some other form of lossy compression, that’s necessary because of limited bandwidth somewhere? Or is it a glitch, or a limitation that could hopefully be resolved with a firmware update?

Based on the description, it’s chroma subsampling.