[/] yet another search quirk

Any idea why a search for "Trans-Canada Highwaymen" doesn't find this queued release?

[bandtoband.com] https://bandtoband.com/queue/album/103501

[ETA: Search finds it now.]

Whereas searching on "Sinead O'Connor" finds the artist Sinéad O'Connor (albeit buried under other ones), "Sergio Mendes" doesn't find the artist Sérgio Mendes. This is perhaps because there are band names without the diacritic (Sergio Mendes Trio, Sergio Mendes & Brasil '66).