I took it out and the rhizome is very soft. When I gently squeezed it, a whitish substance appeared
could tug on the one fan and it came off but the fan tissue connecting it to the rhizome was mushy. I tossed it. The ground in that area is not soaked or has standing water and I'm not seeing a similar issue with others in that grouping so far. This was Lest We Forget.
The other issues I had was with Magic Happens and Kitty Kay. Both of them were planted in a different area and also died off.