Hi Mate, TM only 2 possibilities:
1st
Ph issues/fluctuations due to different soil composition. Probably some roots are feeding on the mix and other roots are feeding on the soil around (it seems to be a clay/calcareous soil)
2nd
Tobacco mosaic viruses infection. There is nothing you can do about it. Generally plants don't die, maybe they produce a little less.
Even for the ph problem there is nothing you can do. I advise you to wait because I am confident that everything will be fine anyway
Good luck🤞