I had a nearly identical issue with this same plant this past March and Jan. Originally I feared the worst, but considered perhaps I’d accidentally dripped fertilizer onto the leaves. In each past case, the decaying progressed and I removed the leaves. Pest? Fungus? I’ve ruled out damage. These two are the most recent issues and began with a strange sheen you may be able to see in the third photo of the same leaf back in mid July. Thank you for any advice you may have if you’re familiar with or have experienced this.





