It just seems weird to be rott, maybe yr soil cover isnt allowing enough air to get into the soil, I'm not sure. All i kno is that when mine got burned only the tops and newly forming leaves died off, maybe tree tips of some that were poking out from the top of the rest, but i simply removed them and they grew back, the ones treat the actual stocks got burned on had lost a free stocks and lots of leaves and they just broke off like hard little chips of something..plastic maybe(?) Can't really explain it.
But i guess if they were in shade it can't be burns but it could still be Frost bite,mine had that too, but the leaves are usually all droopy looking and the stocks are all squishy and saggy and the plant kinda has this smell, that i can't explain almost like strong plant matter of some sort(?) But that's my experience. I just cut all dead stocks down and pulled off leaves and they are trying to grow back the once very dense leaves they once had until someone had to rip down those heat providing/sun blocker barriers onmy Windows
I guess we'll wait until we see the pics of the roots i guess. Btw, the soil straight from the bag is sometimes a little damp when using it - even that is enough to cause the plant to lose leaves and rot, but they wouldn't get the same color and that look of lottle crystals on the hard grayish leaves that feel like plastic or
