Since Firedrake updated their UFL the steady_swe test has been failing when setting up the diagfftpc block solvers with this error message:
/home/firedrake/firedrake/src/ufl/ufl/algorithms/apply_derivatives.py:889: in reference_grad
error("Currently no support for ReferenceGrad in CoefficientDerivative.")
Since Firedrake updated their UFL the steady_swe test has been failing when setting up the diagfftpc block solvers with this error message: