Partial syntax highlighting in Unity project after loading finishes

Kind of similar to this post, but mine is a Unity project: https://rider-support.jetbrains.com/hc/en-us/community/posts/8674549232274-Only-partial-Syntax-Highlighting-for-Unreal.

Everything else seems to work fine, I'm just not getting full syntax color highlighting.

Fresh Unity install: Unity 2021.3.3f1

Fresh Rider install: 2022.3.2

The external editor is set in Unity

The Rider package is installed in Unity

Highlight: All Problems is selected

I then open the project from Unity by right clicking on Assets and selecting the option "Open C# project".

I uploaded Rider logs at this Upload ID: 2023_02_06_pZw4XT5rWDhjDMd5nTgxyo  

And I uploaded a dump of the highlighters at this Upload ID: 2023_02_06_24Tp411fyzDxaPWSaJoMZx 

When the project first opens up, I get full syntax highlighting

But after a few seconds when it finishes loading, it only has basic syntax highlighting

I also tried invalidating caches, and installing Rider EAP.