This is something I noticed with the "Independent Voices" colorway collection; it's not new behavior, it goes back to Proton, but it's especially obvious with themes that have a toolbar background that's not very light or dark (e.g. "Balanced" colorways), and are as such more prone to producing subpar contrast with the text color.
Bug 1783868 Comment 0 Edit History
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This is something I noticed with the "Independent Voices" colorway collection; we use the toolbar color at 70% opacity, and that's not new behavior, it goes back to Proton, but it's problematic and especially obvious with themes that have a toolbar background that's not very light or dark (e.g. "Balanced" colorways), and are as such more prone to producing subpar contrast with the text color.