It looks like a Bacterial rot alright - maybe fusarian wilt which works from the inside - Some people heat a hot piece of iron and scorch the cut when the take away the rotten bulb, spray the cut with tree pruning seal or sprinkle cinnamon on the wound. A hot cutting tool also works.
I had some rotten leaves after using "Bayer All in one" and only used it on a few plants to see the effect. I think we need to know what the fertilizer component of the "All in One" . I did use the Bayer "Tree and Shrub" but stopped after Bayer started to add fertilizer to that one too.
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