I have no idea. I’ve never grown tomatoes from ‘wet’ seed before.
Yellowing leaves are a nutrition issue...if you didn’t start fertilizing the seedlings when they had their first set of ‘true’ leaves, then that may be the issue.
Brown leaves are either disease or bad watering practices.
Really can’t tell without seeing the plants. How much longer is your growing season? Do you have another 90+ days to grow these to maturity?
I think I can last into October, no problem.
I’m figuring too much water - small planter had drainage issues (had almost as bad with pepper plants but they’re doing OK - soil smelled bad - I’m drying out that particular soil in the back in the Sun all day).
Everything transplanted to better planters with fresh planting soil - except I kept the small patch they were in to minimize transplant shock. We’ll see if better drainage fixes it.
I still have some bone meal left if that will help.