Hello all, does anyone know why the following would happen?

$ ./pants --tag="something" filter 3rdparty/python:ansicolors
Exception caught: (<class 'pants.build_graph.address_lookup_error.AddressLookupError'>)

Exception message: Build graph construction failed: ResolveError "ansicolors" was not found in namespace "3rdparty/python". Did you mean one of:
  :ansicolors
  ...
  :requests
  :requirements.tx

It exists in the requirements file:

ag ansicolors 3rdparty/python/requirements.txt
7:ansicolors==1.1.8

I am getting this for any existing target with

filter

. Did filter change in 1.9.x?