Google scholar search query issue
I don't think it disappears: it's probably just ranked low in the general query results. 

If you restrict the search with keywords "political determinants fiscal transparency" to "results since 2017" (https://scholar.google.com/scholar?as_ylo=2017&amp;q=political+determinants+fiscal+transparency&amp;hl=en&amp;as_sdt=0,33) (note the "as_ylo=2017" in the URL), your paper is ranked first.