No solar charging in Instinct 2 Solar?

Recently I found that my Instinct 2 Solar ONE PIECE LUFFY edition (Chinese version) cannot charge by solar energy once it was charged by USB. I noticed this problem in Garmin Connect app -> Solar Intensity. No solar intensity data for a few days after USB charging, even when the battery level has already dropped below 90%.

The software version is 13.21.

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