I asked if you were using a mac, because I've seen this flickering reported before, unfortunately, without any workarounds. I imagine that the color picking issues are related. When you directly click a raw shape, it picks the shape properties and in this case it is likely going to work correctly. When you drag a color picker, this is a different method of picking - I believe from the screen buffer - which is likely causing the error. From what I have seen people say here on the forums, the last properly supported mac OS is Monterey.
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