This [change](https://github.com/dart-lang/sdk/commit/fb5ffc827580ae49cd4611d3ddf0ad3c7c592c54#diff-60648d19c0fe66d08d01fb7a449378bb80241a95601fe86b3d34962586abb886) to null safety removed a bunch of property parsing logic for the `Instance` class. Thus `fields` among other properties are always null.
