Zygote issue with StaticArrays?

[erlebach]

Here is an error trace, which indicates an error relating to Zygote and static arrays. The error indicates that Zygote is trying to modify a static array. Why would it do that? Isn't Zygote only supposed to create new arrays? After all, Zygote can take the derivative of a Static Array, can't it? Thanks for any insight!

ERROR: LoadError: setindex!(::StaticArraysCore.SMatrix{3, 3, Float64, 9}, value, ::Int) is not defined.
Stacktrace:
 [1] error at ./error.jl:35
 [2] setindex! at /Users/erlebach/.julia/packages/StaticArrays/pTgFe/src/indexing.jl:3
 [3] macro expansion at /Users/erlebach/.julia/packages/StaticArrays/pTgFe/src/indexing.jl:66
 [4] _setindex!_scalar at /Users/erlebach/.julia/packages/StaticArrays/pTgFe/src/indexing.jl:46
 [5] setindex! at /Users/erlebach/.julia/packages/StaticArrays/pTgFe/src/indexing.jl:42
 [6] setindex! at /Users/erlebach/.julia/packages/RecursiveArrayTools/VzH8Y/src/vector_of_array.jl:336
 [7] macro expansion at ./multidimensional.jl:946
 [8] macro expansion at ./cartesian.jl:64
 [9] macro expansion at ./multidimensional.jl:941
 [10] _unsafe_setindex! at ./multidimensional.jl:953
 [11] _setindex! at ./multidimensional.jl:930
 [12] setindex! at ./abstractarray.jl:1344
 [13] AbstractVectorOfArray_getindex_adjoint at /Users/erlebach/.julia/packages/RecursiveArrayTools/VzH8Y/src/zygote.jl:121
 [14] #108#back at /Users/erlebach/.julia/packages/ZygoteRules/AIbCs/src/adjoint.jl:67
 [15] Pullback at /Users/erlebach/src/2022/rude/giesekus/GE_rude.jl/rude_optimized/rude_functions.jl:277
 [16] Pullback at /Users/erlebach/.julia/packages/Zygote/g2w9o/src/compiler/interface2.jl:0
 [17] Pullback at /Users/erlebach/src/2022/rude/giesekus/GE_rude.jl/rude_optimized/rude_impl.jl:188
 [18] Pullback at /Users/erlebach/.julia/packages/Zygote/g2w9o/src/compiler/interface2.jl:0
 [19] Pullback at /Users/erlebach/src/2022/rude/giesekus/GE_rude.jl/rude_optimized/rude_impl.jl:199
 [20] Pullback at /Users/erlebach/.julia/packages/Zygote/g2w9o/src/compiler/interface2.jl:0
 [21] #208 at /Users/erlebach/.julia/packages/Zygote/g2w9o/src/lib/lib.jl:206
 [22] #2066#back at /Users/erlebach/.julia/packages/ZygoteRules/AIbCs/src/adjoint.jl:67
 [23] Pullback at /Users/erlebach/.julia/packages/SciMLBase/gTrkJ/src/scimlfunctions.jl:3904
 [24] Pullback at /Users/erlebach/.julia/packages/Zygote/g2w9o/src/compiler/interface2.jl:0
 [25] #208 at /Users/erlebach/.julia/packages/Zygote/g2w9o/src/lib/lib.jl:206
 [26] #2066#back at /Users/erlebach/.julia/packages/ZygoteRules/AIbCs/src/adjoint.jl:67
 [27] Pullback at /Users/erlebach/.julia/packages/Optimization/XjqVZ/src/function/zygote.jl:30
 [28] Pullback at /Users/erlebach/.julia/packages/Zygote/g2w9o/src/compiler/interface2.jl:0
 [29] #208 at /Users/erlebach/.julia/packages/Zygote/g2w9o/src/lib/lib.jl:206
 [30] #2066#back at /Users/erlebach/.julia/packages/ZygoteRules/AIbCs/src/adjoint.jl:67
 [31] Pullback at /Users/erlebach/.julia/packages/Optimization/XjqVZ/src/function/zygote.jl:34
 [32] Pullback at /Users/erlebach/.julia/packages/Zygote/g2w9o/src/compiler/interface2.jl:0
 [33] #60 at /Users/erlebach/.julia/packages/Zygote/g2w9o/src/compiler/interface.jl:45
 [34] gradient at /Users/erlebach/.julia/packages/Zygote/g2w9o/src/compiler/interface.jl:97
 [35] #157 at /Users/erlebach/.julia/packages/Optimization/XjqVZ/src/function/zygote.jl:32
 [36] macro expansion at /Users/erlebach/.julia/packages/OptimizationOptimisers/KGKWE/src/OptimizationOptimisers.jl:36
 [37] macro expansion at /Users/erlebach/.julia/packages/Optimization/XjqVZ/src/utils.jl:37
 [38] #__solve#1 at /Users/erlebach/.julia/packages/OptimizationOptimisers/KGKWE/src/OptimizationOptimisers.jl:35
 [39] #solve#552 at /Users/erlebach/.julia/packages/SciMLBase/gTrkJ/src/solve.jl:85
 [40] single_run at /Users/erlebach/src/2022/rude/giesekus/GE_rude.jl/rude_optimized/rude_impl.jl:206
 [41] top-level scope at /Users/erlebach/src/2022/rude/giesekus/GE_rude.jl/rude_optimized/rude_script.jl:163
 [42] eval at ./boot.jl:368