Eyedropper picks up the wrong values when sampling a filled clipping mask
I am using Mac OS 10.15.7 and am able to consistently reproduce this bug in both AI CC 2021 but as far back as AI CS5 running in Mac OS 10.6.8
When a fill is applied to a clipping mask, the eye dropper will pick up incorrect CMYK/RGB values. This is especially problematic when a pure black is replaced by a 4 color process build in the printing industry.
I would expect to eye drop the exact values applied to the object I've clicked on.

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A workaround I use is to click the edge of the filled clipping mask — then the value gets picked correctly.
Definitely a bug — please upvote it. -
冷小莫 commented
Create 2 objects, select them and create a clipping mask.
Apply a color to the mask.
Create an object.
Use the Eyedropper to pick up the clipping mask color outside the clipped object.
The resulting color is different than the mask color.
The color is correct when the Eyedropper is inside the clipped object.使用吸管工具吸取剪切蒙版的颜色会出错
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Tim commented
Can confirm i have this same experience consistently. I believe that even though the eye dropper picks up the wrong color (a seemingly arbitrary color), it still prints correctly, anybody else tested that?