"say not to report any 1099-NEC income on Schedule 1, unless it is not subject to SE tax."

But only you know how to enter what applies to what you are doing. Your initial input described what you were trying to do is what is wrong; not the IRS or the program.

There are so many variables such as: someone helping sell something at a product show or premier event (casual labor) is not running a business for that event; clergy has various considerations; student/internship/graduate student placements; notary public and election judges; etc. Just like the Difficulty of Care W2 isn't a "real" W2. I can't even begin to list all the permutations.

If it walks like a duck, it seems to be Sched C time for you.