As noted in https://github.com/QuantumKitHub/MatrixAlgebraKit.jl/commit/54f602172716372f84424b97fe585222e887e0ca#r185141141 and also notable in https://github.com/QuantumKitHub/MatrixAlgebraKit.jl/pull/227, the SVD pullback triggers scalar indexing due to the computation of `ΔS₁` [here](https://github.com/QuantumKitHub/MatrixAlgebraKit.jl/blob/main/src/pullbacks/svd.jl#L93).
As noted in 54f6021#r185141141 and also notable in #227, the SVD pullback triggers scalar indexing due to the computation of
ΔS₁here.