Huh! Interesting discussion. Nice pics too Mach. Mine would never be that loaded with prey but it was certainly catching plenty of food and during its first Summer several side growths broke dormancy. I figured it just meant it was happy and able to support several active growth points. I don't recall any issues though with leaves dying off or changing morphology.
Hard to dismiss the brownish color at the base of the sickly seedling, odds are whatever is causing it is also causing the premature leaf death. Since it seems to have affected the outer leaves first, whatever it is must be working it's way inward. Hopefully the fungicide halts it without causing any damage. Will keep you posted.