Getting this error calling

get_sources()

on an adaptor from a HydratedTarget:

File "/Users/benjyw/.cache/pants/setup/bootstrap-Darwin-x86_64/1.20.0.dev1_py37/lib/python3.7/site-packages/pants/engine/legacy/structs.py", line 69, in get_sources
          globs = BaseGlobs.from_sources_field(sources, self.address.spec_path)
        File "/Users/benjyw/.cache/pants/setup/bootstrap-Darwin-x86_64/1.20.0.dev1_py37/lib/python3.7/site-packages/pants/engine/legacy/structs.py", line 315, in from_sources_field
          raise ValueError('Expected either a glob or list of literal sources: got: {}'.format(sources))
      ValueError: Expected either a glob or list of literal sources: got: EagerFilesetWithSpec(...)