I'd say Drew Helleson fits the criteria. 2nd rounder who was supposed to be more of safe pick, if not with the greatest upside. Progressed well through three college seasons following his draft, signed at the end of his college season in D+3 (after being traded to ANA with a 2nd round pick for Josh Manson) and saw significant AHL time that year (17 regular season games and two in the playoffs).
2022/23 (D+4) was his first full season as a pro, he had the usual rookie defenseman growing pains in the AHL but showed well enough to earn a three game NHL debut at season's end, where most of us agreed he handled himself quite well.
This past season (D+5) you would have expected him to step up and solidify his status as an NHL option, having a full pro season and NHL debut under his belt. He did deal with a couple injuries, one that had him out for a couple weeks shortly into the new year and another that made him miss a month from late Feb to late March (possibly preventing an NHL call up when the Ducks moved Lybushkin).
Nonetheless, it doesn't speak well to Helleson's development this season, that he saw zero NHL time as a D+5 23 year old, for a bad team that gave significant minutes to several younger D (Mintyukov, Luneau, Lacombe, Zellweger) and two waiver pickups (Lagesson/Lindstrom). I think it's safe to say he's plateaued to some degree and has reached a bit of a make or break point for this coming year, where he will be turning 24 and completing his ELC.