Eyedropper picks the color of the antialiased edge of a stroke blended with the background instead of the actual stroke color
Eyedropper requires a ton of precision when picking a color of s stroke.
Watch the GIF.
Here I have violet and green lines, drawn above a raster image.
I’ve mistaken and used green color instead of violet, and now I want to pick it from the existing line.
I click, precise enough (I hope), but the color picked — the almost correct violet (C74,95 M74,61 — instead of the global 75-75) — is not in the background at all. It’s a BLENDED color of the RENDERED anti-aliased EDGE of the stroke! So Ai secretly rasterizes what it sees and then checks the tolerance, I assume. And the tiniest overlap leads to these cases. And trust me, this happens a lot.
We can’t trust the tool.

Expected This to be fixed in the latest Beta Build 29.5.0.15
Please comment if it now works fine (or not)