"Weak genetics" (not that the "lineage" is weak, but that the particular plant fell into the "shallow" end of the gene pool), "hermaphrodite", call it what you want, but I did inadvertently stumble upon a way to identify vegging females that will grow nuts and/or spit 'nanner fingers in bloom. It first came to me when I witnessed the phenomenon in La Plata's "Durango OG" (DGOG). I tested my "theory" again on clones taken from the remaining DGOG's, again only expressed in the known "banana tosser" (kept clones of it for this very reason). Later tested on all vegging clones from strains where 1 of them grew nuts and/or spat fingers. Again, only the "banana tosser" from those respective strains exhibited this "unusual" trait in veg (1 "Sour Sunset" from Krockett and 1 "Sour Power" from Karma"). It's a very pronounce tell, can't be missed, or confused. Every strain in that "garden" (~30) was subjected to the "tests" at the same time. That includes 10 different phenos/crosses of Animal Cookies, all of my "clone only" (including "Mystery", she's a finicky gal, real picky, but she passed the test), and TSD 2.0 from TopDawg.
It isn't expressed through exposure to stress, per se, more of an "optical illusion".
Anyhow, the fact that I can definitively identify vegging plants that will go on to throw bananas in bloom tells me that this is genetic.