Could be rot that happened after sunburn. Now most people will completely disagree with me and say that sunburn doesn't cause rot. Except that I had that happen to one of my phals. It got sunburn, and while most of the lesions dried out, some continued to spread as mushy rot. I caught it early and excised all the damaged tissue (and saved the plant) but in your case the plant looks pretty far gone.
As for the last pic, I agree that it looks more like something munched on it
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Camille
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