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One green plus one purple light on AirGradient One

Today our AirGradient One started showing the left most LED in purple and the right most LED in green at the same time. CO2 values are in the range for green. I also checked the explanation for the meaning of the colors of the LEDs, but they only show purple as the only color or alternating with red, when the air quality is really bad.
So what does this single purple LED mean?

Discussed here

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Thank you, that helps a lot!