I thought its lack of water / over heat while low on water at first sight but now i see some of the deficiencies i seen a while ago and cant tell exactly what it is if manganese or magnesium or if manganese even exist here but perhaps a deficiency in early stages, i didnt know it dies green too tho so might be a different case, hope you get fast proper answer.
Almost like sulphur deficiency if i remember well, but my memory is shit. Last edit: try watering it a bit and watch it, ifyou see it get stronger and better within minutes you missing watah. Lol sade i shit myself few mornings ago, it was amazing to see t get back up within minutes.
I noticed in twobranches i cut and put in water for lil experiment,on heat they looked dead within minutes, some strains really need it cooler but im still not sure its the case, overwatering is a huge fuckup if aint hot, nailed a cool streak when mine and one died.