preflower issues

So it’s been about a week into giving plant bloom nutes and changing photoperiod from 18/6 to 12/12and I’ve notice at some of the nodes that these things (circled in pic) have been popping up.. just wanted to know, before I get excited lol, are these the beginning of the preflowers?

The just starting to grow buds are browning and the white pistols are turning dark brown and shriveling. The browning is only where the buds are and slightly on the leaves around the calyx area. It starts lower on the plant and works its way to the top. We need help. Outdoor plants planted in...