Thank you very much for the clarification.
I checked the project settings, and it looks like the donation / payment setting was still left at the default state.
I have now changed the public project page to use the “No Payments” option.
That may explain why the page disappeared from search after it was marked as sensitive content.
Also, thank you for explaining the creator-name search behavior. I mentioned it as an additional symptom because the search box says it can search for creators, but if creator-name search only shows indexed projects by that creator, then it makes sense that nothing would appear while the project itself is not indexed.
I appreciate the help.