Facets containing single quotes won't give results. The author we see this issue with is "Kum'a N'dumbe". The author shows in the facets normally, but there are always no results when the facet is selected. We had first assumed this to be bug 13812, but is hasn't fixed the issue.
I cannot recreate, was this on elastic or zebra? Can you share a sample record?
Zebra in 20.11. I'll check for the record later, but it should be ok to manually catalog the authority for a person with that name.
I just retested this with "Kum'a N'dumbe" and "Test'me" and both work nicely in newer versions. I believe this has been fixed.