Trying to use a thin feature but the thin feature does not even show up as an option within extrude -cut or boss-extrude.
Did you convert the entities on both the green and blue lines or just the green line?
when you once accept a extrude/cut feature without "Thin feature" option selected it's going to go out of the dialogue. When you edit the feature next time it's not going to be available at all.
Delete the feature, and add it again.
Hope this helps.
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