Problem with extend if things are in a specific order (ERROR: type ReactionSystem has no field gui_metadata)

[TorkelE]

Get problems when extending a reaction system with a MTK ODESystem. However, it is only for one order. Does it seem useful to have both orders work?

Example:

using Catalyst, ModelingToolkit, OrdinaryDiffEq

@parameters h
@variables t T(t)
D = Differential(t)
eq = D(T) ~ h - T
@named heater = ODESystem([eq])

equi_system = @reaction_network begin
    @variables T(t)
    (T,1), X <--> Y
end

@named heat_system = extend(equi_system, heater) # Error
@named heat_system = extend(heater, equi_system) # Works

This is the error message:

ERROR: type ReactionSystem has no field gui_metadata
Stacktrace:

get_gui_metadata(sys::ReactionSystem{Catalyst.NetworkProperties{Int64, SymbolicUtils.BasicSymbolic{Real}}}) at [/home/torkelloman/.julia/packages/ModelingToolkit/xLMQM/src/systems/abstractsystem.jl](vscode-file://vscode-app/snap/code/134/usr/share/code/resources/app/out/vs/code/electron-sandbox/workbench/workbench.html)

kwcall(::NamedTuple{(:name,), Tuple{Symbol}}, ::typeof(extend), sys::ReactionSystem{Catalyst.NetworkProperties{Int64, SymbolicUtils.BasicSymbolic{Real}}}, basesys::ODESystem) at [/home/torkelloman/.julia/packages/ModelingToolkit/xLMQM/src/systems/abstractsystem.jl](vscode-file://vscode-app/snap/code/134/usr/share/code/resources/app/out/vs/code/electron-sandbox/workbench/workbench.html)

top-level scope at [/home/torkelloman/.julia/packages/ModelingToolkit/xLMQM/src/systems/abstractsystem.jl](vscode-file://vscode-app/snap/code/134/usr/share/code/resources/app/out/vs/code/electron-sandbox/workbench/workbench.html)