Text-To-Speech engine

I don’t know if it’s a bug, but when I open Text to Speech Settings, the only engine available is “Default”. There, only Microsoft David and Zira are available. But on my system I have Text Aloud with other engines (I assume they are engines) and voices (IVONA , Cerence, AT&T Natural Voices). And I can use those voices on other programs. So I guess Scrivener 2.9.9.19 is not seeing them correctly.