Sacha

This name can also be a Feminine name in several other countries other than French-speaking countres as a variant of Sasha and Sascha, making this name Unisex.
https://forebears.io/forenames/sacha
https://en.wiktionary.org/wiki/Sacha
https://en.wikipedia.org/wiki/Sasha_(name)
https://www.popular-babynames.com/name/sacha
https://www.behindthename.com/name/sasha
https://www.behindthename.com/name/sascha

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According to the Office for National Statistics census of England and Wales, 89 girls and 17 boys were recorded with the name Sacha in 1999.
https://www.behindthename.com/name/sacha/top/england-wales
https://names.darkgreener.com/#sacha

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According to the USA Social Security Administration, 103 girls and 23 boys were recorded with the name Sacha in 1977.
https://www.nancy.cc/baby-name/sacha/
https://www.names.org/predictions/sacha
https://www.names.org/n/sacha/about

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I also found three Feminine bearers of this name.
https://en.wikipedia.org/wiki/Sacha_McMeeking
https://en.wikipedia.org/wiki/Sacha_Parkinson
https://www.google.com/search?q=sacha+visagie

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I'm just wondering why on June 09th 2023, the gender of Sacha is changed from "Masculine & Feminine" to just "Masculine"?

This name is predominantly masculine in France.

All but one of the Sachas I know are male, so I see this as a masculine name. I think I like it better for a boy. I prefer Sasha on a girl.

In Slovenija, which is the country next to Croatia, the name is also common. But it is spelled differently: Saša. And it is used for f and m.