Can you please try this pre-release version and see if it helps? You’ll need to be signed in to GitHub for the link to work.
https://github.com/CesiumGS/cesium-unreal/suites/14345651765/artifacts/808908763
Uninstall Cesium for Unreal via the Marketplace and then extract the ZIP linked above to C:\Program Files\Epic Games\UE_5.2\Engine\Plugins\Marketplace or the equivalent on your system.
Alternatively, if you can tell me exactly where you’re looking, I can take a look myself and confirm (as I hope) that the quality is improved by the new build.