The thing that seemed to work was to close all VS windows, delete the .vs folder from the target project and then reopen the project and leave the background task finish before making any interaction.

Now I have all the CSS suggested, but it does still fail from time to time without knowing why, so I leave this question open if there's a way to increase IntelliSense limits

[UPDATE] I opened the same issue at the Developer Community and it does seem to have been fixed with VS 2022 17.1 Preview 3, I didn't test it(I'm gonna do that when it's in the stable branch) but given no further way to fix I will mark this question as solved.

I'm likely misreading this, but you might be able to try increasing the Intellisense cache size. I'd also suggest attempting to clean out the icph folder of any extra cache stored in there.