These are all errors in replication and not code, if I ask DNA to replicate it can produce errors when placed in the wrong environment. You are seeing this but the code stays the same which means that replication error did not imprint it's genetic trait and there is no code for these mutations to carry into another generation.
It's like cancer, I get a tumor grow on my neck, do I now have the cancer trait which passes onto my kids and makes a neck tumour on them? Then I get cured, where have those tumour genetics gone?
I could have DNA which is more prone to replicate errors and make cancer but their is no cancer trait and that is a spontaneous condition that wasn't there when I was born.
Brown hair is a trait, cancer is not a trait, one breeds the other is a result of DNA breaking down. Your plant has a type of cancer not mutation, stress causes hormones to make DNA divide that shouldn't be recieving it and you have the wrong type of environment for it.
The petiole of a leaf just like a stalk or stem contains cells that can replicate branches, roots, leaves, bud and is well studied in the genetic world, even a few cells from a stem can replicate a whole plant and it's been done with cell culture s. That's all you are seeing, there is no DNA that makes three leafed seeds but there is a condition in a plant where at the moment the seeds first cells divide a simple genetic error from hormonal stress can trigger an extra leaf to replicate. The DNA stays the same it's just replicated wrongly, if you extracted that DNA you would see it's missing segments and degraded compared to the original, breed this and you get Futher breakdowns and a dead end just like the result of cancer.
You shoot down what you don't know and aren't prepared to accept, it's been done before which is the reason these type of strains don't and cannot exist.