Well I was about to say TMV as I’ve had a similar problem with some dodgy seeds in the distant past . So guilty your honor . Actually that’s exactly what TMV looks like . So I’d be careful if I was @Donk .
Sausage , I’ve looked at this same chart a hundred times and I just noticed the contrast a plant gets with a zinc deficiency , I have one just like it , the variation in the leaf colour , the burnt tips and the progression of it . Why a zinc deficiency in one out of six . They all get the same nutrient so it makes it a bit tricky . I’ll just give them all more zinc I guess . I noticed the discolouration a while ago and thought it was an unusual phenotype as there is another one the same next to it but without the burnt tips . Oh well , I fix … Peace .
I lazily summoned grok. Im not knowledgeable enough at identifying issues. Should just remained quiet beyond calling in those better at diagnosis. I need to take the time to educate myself on such things.