Green Carbon star?

Interesting things Beautiful or unusual objects
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https://www.legacysurvey.org//viewer/?ra=197.4735&dec=23.4279&layer=ls-dr10&zoom=15

For some reason, this carbon star became green in the Legacy Survey data releases after DR6 and 7. Is there a problem with the filters?

It also has some interesting long-term variability as seen in this lightcurve: ASAS-SN Photometry Database

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The green color just comes because the z-band images (contributing the red channel) are masked - see the Singe Exposures link

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