Very unlikely it will hurt the plants at all..
Fabric pots typically breathe a lot, there being water at the base of the pot isn't going to hurt anything. Risers are a good move though to ensure they aren't being overly saturated. I actually had 3 extra plants this year that were 10 gal, didn't wanna dig big ass holes for them so I just used fabric pots and cut out the bottoms so the roots grow right into the ground as insurance. I still top feed them every few days, they're planted in Promix HP-CC.