Its a rare pheno that just wont mature. Heres another thread with one.
Mine was in the same tent with two others that were perfectly fine.
They just keep growing new flowers, there are minimal trichs, and the bud structure does look like a reveg but its an autoflower so that cant be. Plus if it was revegging it would stop growing flowers.
This one from the OP is 28 weeks old. You gotta cut losses and move on.