Variables not found even though they definitely exist

[1-Bart-1]

I am getting an error when running linearization_function. Using s.full_sys = complete(s.full_sys) doesn't help.

julia> [s.full_sys.set_values...]
3-element Vector{Num}:
 sys₊set_values[1]
 sys₊set_values[2]
 sys₊set_values[3]

julia> [s.full_sys.ω_b...]
3-element Vector{Num}:
 (sys₊ω_b(t))[1]
 (sys₊ω_b(t))[2]
 (sys₊ω_b(t))[3]

julia> lin_fun, simplified_sys = linearization_function(s.full_sys, [s.full_sys.set_values...], [s.full_sys.ω_b...])
┌ Warning: An empty operating point was passed to `linearization_function`. An operating point containing the variables that will be changed in `linearize` should be provided. Disable this warning by passing `warn_empty_op = false`.
└ @ ModelingToolkit ~/.julia/packages/ModelingToolkit/oBkpS/src/linearization.jl:51
ERROR: Some specified inputs were not found in system. The following variables were not found Any[sys₊set_values[3], sys₊set_values[2], sys₊set_values[1]]
Stacktrace:
  [1] error
    @ ./error.jl:44
  [2] #markio!#824
    @ ~/.julia/packages/ModelingToolkit/oBkpS/src/linearization.jl:577
  [3] markio!
    @ ~/.julia/packages/ModelingToolkit/oBkpS/src/linearization.jl:548 [inlined]
  [4] _structural_simplify!(state::TearingState{…}, io::Tuple{…}; simplify::Bool, check_consistency::Bool, fully_determined::Bool, warn_initialize_determined::Bool, dummy_derivative::Bool, kwargs::@Kwargs{…})
    @ ModelingToolkit ~/.julia/packages/ModelingToolkit/oBkpS/src/systems/systemstructure.jl:735
  [5] _structural_simplify!
    @ ~/.julia/packages/ModelingToolkit/oBkpS/src/systems/systemstructure.jl:723 [inlined]
  [6] structural_simplify!(state::TearingState{…}, io::Tuple{…}; simplify::Bool, check_consistency::Bool, fully_determined::Bool, warn_initialize_determined::Bool, kwargs::@Kwargs{…})
    @ ModelingToolkit ~/.julia/packages/ModelingToolkit/oBkpS/src/systems/systemstructure.jl:681
  [7] __structural_simplify(sys::ODESystem, io::Tuple{…}; simplify::Bool, sort_eqs::Bool, kwargs::@Kwargs{…})
    @ ModelingToolkit ~/.julia/packages/ModelingToolkit/oBkpS/src/systems/systems.jl:93
  [8] structural_simplify(sys::ODESystem, io::Tuple{…}; additional_passes::Vector{…}, simplify::Bool, split::Bool, allow_symbolic::Bool, allow_parameter::Bool, conservative::Bool, fully_determined::Bool, kwargs::@Kwargs{})
    @ ModelingToolkit ~/.julia/packages/ModelingToolkit/oBkpS/src/systems/systems.jl:34
  [9] structural_simplify
    @ ~/.julia/packages/ModelingToolkit/oBkpS/src/systems/systems.jl:29 [inlined]
 [10] io_preprocessing(sys::ODESystem, inputs::Vector{Any}, outputs::Vector{Any}; simplify::Bool, kwargs::@Kwargs{})
    @ ModelingToolkit ~/.julia/packages/ModelingToolkit/oBkpS/src/systems/abstractsystem.jl:2565
 [11] io_preprocessing
    @ ~/.julia/packages/ModelingToolkit/oBkpS/src/systems/abstractsystem.jl:2563 [inlined]
 [12] linearization_function(sys::ODESystem, inputs::Vector{…}, outputs::Vector{…}; simplify::Bool, initialize::Bool, initializealg::Nothing, initialization_abstol::Float64, initialization_reltol::Float64, op::Dict{…}, p::SciMLBase.NullParameters, zero_dummy_der::Bool, initialization_solver_alg::NonlinearSolveFirstOrder.GeneralizedFirstOrderAlgorithm{…}, autodiff::AutoForwardDiff{…}, eval_expression::Bool, eval_module::Module, warn_initialize_determined::Bool, guesses::Dict{…}, warn_empty_op::Bool, kwargs::@Kwargs{})
    @ ModelingToolkit ~/.julia/packages/ModelingToolkit/oBkpS/src/linearization.jl:61
 [13] linearization_function(sys::ODESystem, inputs::Vector{Num}, outputs::Vector{Num})
    @ ModelingToolkit ~/.julia/packages/ModelingToolkit/oBkpS/src/linearization.jl:33
 [14] top-level scope
    @ REPL[32]:1
Some type information was truncated. Use `show(err)` to see complete types.

The system is created and assigned to a field in a struct like this:

    @time @named sys = ODESystem(eqs, t)
    s.full_sys = sys

Versioninfo:

  [961ee093] ModelingToolkit v9.77.0
  [2efcf032] SymbolicIndexingInterface v0.3.40
  [d1185830] SymbolicUtils v3.27.0

julia> versioninfo()
Julia Version 1.11.5
Commit 760b2e5b739 (2025-04-14 06:53 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 16 × Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz
  WORD_SIZE: 64
  LLVM: libLLVM-16.0.6 (ORCJIT, skylake)
Threads: 16 default, 0 interactive, 8 GC (on 16 virtual cores)
Environment:
  LD_LIBRARY_PATH = /usr/local/cuda-12.2/lib64

[ChrisRackauckas]

MWE?

[1-Bart-1]

The set_values were parameters instead of variables, my bad...