ESPN's most recent bracketology has 10 B1G teams in the field. Nebraska is not one of them - they are listed as the third team out.
There are a ton of B1G bubble teams. Rutgers is in the "last 4 byes" group, Oregon & Maryland are in "last 4 in", Nebraska is in "first 4 out" and USC, Iowa & Wisconsin are in "next 4 out".
That means:
7 teams solidly in (Purdue 4 seed, Indiana 5, UCLA 6, Illinois 7, Michigan St 7, Michigan 8, Ohio St 8)
7 bubble teams (Rutgers 10, Oregon 11, Maryland 11, Nebraska, USC, Iowa, Wisconsin)
4 teams solidly out (Washington, Northwestern, Minnesota, Penn St)
NCAA Bracketology: 2025 March Madness men's field predictions (espn.com)