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You're correct in that the setting was renamed, I'll make sure I notify our documentation team here to correct the screenshot in the article that you linked.
However, I'm not able to replicate the 'taxes_included' field returning the wrong value. If taxes are being included in a shop's prices I see 'taxes_included' as 'true' - and vice versa if taxes are not being included in prices.
If you're able to reliably replicate this being incorrect on a shop, could you point me to the shop in question?
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