When I do a "Get Info…" on the drive icon, the green (not yellow) icon shows in the top part of the info window. The fix mentioned above did correct things even though I was dragging "green onto green". I had the same thing. All that matters is that it works!
Jon
macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365
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