I had a similar issue on a auto flower late into flower I couldn’t figure it out and ended up cutting it down early in fear of it ruining the crop.

So thinking about your grow, it is good to figure out what went wrong, but i cant answer directly to that, but two more things from my narrow point of view, if i see two different problems, i think about plant stress, if the stress happened before problems appear is possible, most plant diseases are caused by weak plant deffence beforehand. But now they will certainly be a little stressed, but on the other hand ganjah plants are real tuff when in advanced flowering and considering you cant use foliar sprays on buds, you can flush soil and/or resevoirs and just feed regularly with complete nutes and ride out the rest of the harvest, because you already gotmost of the volume of bud, well maybe not, but like i said the plants are tuffer when flowering, so if you ride em out you will harvest less than ideal, but thats how we learn…you se all the best pics here, but a lot of late flowering rooms are not so pretty, you realy do want to remove as much necrotic or seriously damaged leaves from the room as possible, so as not to breed fungus in there… nothing to be ashamed about, the best thing is to find out how not to make it happen again as you start over