Regression: Cannot deepcopy SteadyStateProblem

[TorkelE]

MWE:

using ModelingToolkit
using ModelingToolkit: t_nounits as t, D_nounits as D

# Prepare equations.
@parameters p d
@variables X(t)
alg_eqs = [0 ~ p - d*X]
diff_eqs = [D(X) ~ p - d*X]

# Create systems
@mtkbuild osys = ODESystem(diff_eqs, t)
@mtkbuild nsys = NonlinearSystem(alg_eqs)

# Create problems.
u0 = [X => 1.0]
ps = [p => 1.0, d => 0.2]
oprob = ODEProblem(osys, u0, 1.0, ps)
nprob = NonlinearProblem(nsys, u0, ps)
ssprob = SteadyStateProblem(osys, u0, ps)

deepcopy(oprob) # Works
deepcopy(nprob) # Works
deepcopy(ssprob)  # ERROR: deepcopy of Modules not supported