Why are some Greek letters read in Unicode values, not with their actual letter


I have a short piece of Greek text here. I'm using ESpeak in the latest alpha of NVDA. There are some of the letters in this that are given Unicode values, not whatever they are, as a named letter. I'll put the text below.

Εὖ δοῦλε ἀγαθὲ καὶ πιστέ

Use left and right arrow, and you can see what I am speaking of.

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