Why does 天才 not rendaku?!

Japanese Language Questions
1

I read Tofugu’s Rendaku article and think I understand the concept at this point.

BUT

Why doesn’t 天才 rendaku to てんざい but instead is てんさい ー is this just one of those exceptions or am I mistaken when I think it should rendaku?

Thanks!

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2

See this part, chinese origin words usually do not rendaku

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