This comes from an autoflowering Lowrider 2. She is at 5 weeks old. Started seeing this happening a few days ago. I'm thinking it's a Phosphorus deficiency. I have 6 other plants in the same kind of soil and all have been receiving the same watering treatment with none of the others showing...
Most definitely will I let it grow out and more younglings I have. Curiously there were others I helped out such as a double embryo. The dormant one wrapped around and almost strangled the good one until I removed it here - https://www.420magazine.com/gallery/data/504/Dbl_Embryo.jpg
And the seed...