How can I delete this stray face?

I did an autout from a solid, but that was left behind… how can i erase it?

it is probably a bad object mesh that can not selected am i right? you have to find the bad surface and duplicate its edges then untrim and trim the surface again and while doing that hope that works.

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It disapeared by itself. Seemend to be a display error. Thank you!

may be you deleted the bad object