Hey,
I have a problem, where Alfred loses the ability to search in files. I think I've tried to "rebuild macOS Metadata" six or seven times now, and every time the results is the same: After the reindex has been done, Alfred is able to search for the contents of any document just fine. But within an hour or two, the results gradually disappears until I'm left with a pretty crippled file search.
E.g. if I search for a term it will show still fewer file results. The order of the files disappearing is always the same.
There are no problems whatsoever with searching for the same terms in Spotlight.
I search the contents of my pdfs quite often, so it's a vital feature for me.