As I asked in the title. Were there any groups you thought you would stan or perhaps stanned briefly, but then it faded out and you barely know what they're up to now?
For me: Purple Kiss. I was really into Mamamoo back then, and also liked ONEUS and ONEWE from RBW. Couldn't wait for their debut, but then it got postponed and they also did some pre-debut stuff. It all watered down what enthusiasm I had. Didn't like their debut much and after that spent almost no attention to them.
I prefer debuts and comebacks to not have prereleases (afterwards is fine) so all the focus is on the new title song at first and the fun surrounding promoting that.