Publishing a result in a test step called Verdict causes OpenTAP to throw an exception later if the verdict of a test step run is queried. This happens because the getter has this logic:

case string r:
  return (Verdict) StringConvertProvider.FromString(r, TypeData.FromType(typeof(Verdict)), null);    

This obviously crashes if Verdict is a string, and it is not a Verdict.

Errors caused due to this are hard to track down because

1. They are only triggered if a result listener happens to check the step verdict
2. They are triggered in logic completely unrelated to where the result was published

I think Results.Publish(...) should fail immediately if a result column that OpenTAP depends on would be overwritten.