GrowDranswered grow question a year ago I understand that multiple people have said add nutes.
This might NOT be the case (and most likely is not). Your plants look like they have just finally reached the right size for your pots (Roots are hitting the edge of the fabric). Those new roots are looking for water to dilute nutrients already existing in your soil.
If they can't dilute the nutrients (no water), they stress out and start to die. This is exactly what "Nutrient lockout" is. So much nutrients that it's nearly impossible to uptake water without hella nutrients. Your baby roots(Lower in the pot) are hurting.
This is a VERY common issue with soil growth, especially in fabric pots. They dry out a lot faster, water these plants until there is outflow, then get your EC/PPM meter and see what that measurement is.
If the outflow is within the range you are looking for, that was your issue, they needed more water. You will be surprised how much nutrients are in good soil (even in light or undertreated soil)
If the outflow is low (which I doubt) add some nutes in PH-balanced water.