This has happened to three carmen peppers on this plant. Grown in zone 5.
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Blossom-end rot is an abiotic disorder of peppers caused by calcium deficiency during fruit development.
Image 2 to from this source

Gyrfalcon
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I had ruled that out because I thought that started on the very bottom of the fruit. – nuggethead Jul 18 '22 at 13:14
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1Make a vertical cut in the bottom: It most likely starts on the very bottom **inside** the fruit. – Gyrfalcon Jul 18 '22 at 14:24
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Interesting! I already trashed them but I will investigate if any others pop up – nuggethead Jul 18 '22 at 15:01