`eltype` not inferred in broadcasting involving sparse arrays

julia> using LinearAlgebra, SparseArrays, StructArrays

julia> D = sparse(Diagonal(Float64[1:4;]));

julia> S = StructArray{ComplexF64}((D, D));

julia> ComplexF64.(S)
4×4 SparseMatrixCSC{Any, Int64} with 4 stored entries:
Error showing value of type SparseMatrixCSC{Any, Int64}:
ERROR: MethodError: no method matching zero(::Type{Any})

Closest candidates are:
  zero(::Type{Union{Missing, T}}) where T
   @ Base missing.jl:105
  zero(::Union{Type{P}, P}) where P<:Dates.Period
   @ Dates ~/packages/julias/julia-1.9/share/julia/stdlib/v1.9/Dates/src/periods.jl:51
  zero(::AbstractIrrational)
   @ Base irrationals.jl:151
  ...

Stacktrace:
  [1] zero(#unused#::Type{Any})
    @ Base ./missing.jl:106
  [2] getindex
    @ ~/packages/julias/julia-1.9/share/julia/stdlib/v1.9/SparseArrays/src/sparsematrix.jl:2504 [inlined]
  [3] isassigned(::SparseMatrixCSC{Any, Int64}, ::Int64, ::Int64)
    @ Base ./abstractarray.jl:606
  [4] alignment(io::IOContext{Base.TTY}, X::AbstractVecOrMat, rows::Vector{Int64}, cols::Vector{Int64}, cols_if_complete::Int64, cols_otherwise::Int64, sep::Int64, ncols::Int64)
    @ Base ./arrayshow.jl:68
  [5] _print_matrix(io::IOContext{Base.TTY}, X::AbstractVecOrMat, pre::String, sep::String, post::String, hdots::String, vdots::String, ddots::String, hmod::Int64, vmod::Int64, rowsA::UnitRange{Int64}, colsA::UnitRange{Int64})
    @ Base ./arrayshow.jl:207
  [6] print_matrix(io::IOContext{Base.TTY}, X::SparseMatrixCSC{Any, Int64}, pre::String, sep::String, post::String, hdots::String, vdots::String, ddots::String, hmod::Int64, vmod::Int64)
    @ Base ./arrayshow.jl:171
  [7] print_matrix
    @ ./arrayshow.jl:171 [inlined]
  [8] print_array(io::IOContext{Base.TTY}, S::SparseMatrixCSC{Any, Int64})
    @ SparseArrays ~/packages/julias/julia-1.9/share/julia/stdlib/v1.9/SparseArrays/src/sparsematrix.jl:339
  [9] show(io::IOContext{Base.TTY}, #unused#::MIME{Symbol("text/plain")}, X::SparseMatrixCSC{Any, Int64})
    @ Base ./arrayshow.jl:399
 [10] (::REPL.var"#55#56"{REPL.REPLDisplay{REPL.LineEditREPL}, MIME{Symbol("text/plain")}, Base.RefValue{Any}})(io::Any)
    @ REPL ~/packages/julias/julia-1.9/share/julia/stdlib/v1.9/REPL/src/REPL.jl:276
 [11] with_repl_linfo(f::Any, repl::REPL.LineEditREPL)
    @ REPL ~/packages/julias/julia-1.9/share/julia/stdlib/v1.9/REPL/src/REPL.jl:557
 [12] display(d::REPL.REPLDisplay, mime::MIME{Symbol("text/plain")}, x::Any)
    @ REPL ~/packages/julias/julia-1.9/share/julia/stdlib/v1.9/REPL/src/REPL.jl:262
 [13] display
    @ ~/packages/julias/julia-1.9/share/julia/stdlib/v1.9/REPL/src/REPL.jl:281 [inlined]
 [14] display(x::Any)
    @ Base.Multimedia ./multimedia.jl:340
 [15] #invokelatest#2
    @ ./essentials.jl:816 [inlined]
 [16] invokelatest
    @ ./essentials.jl:813 [inlined]
 [17] print_response(errio::IO, response::Any, show_value::Bool, have_color::Bool, specialdisplay::Union{Nothing, AbstractDisplay})
    @ REPL ~/packages/julias/julia-1.9/share/julia/stdlib/v1.9/REPL/src/REPL.jl:305
 [18] (::REPL.var"#57#58"{REPL.LineEditREPL, Pair{Any, Bool}, Bool, Bool})(io::Any)
    @ REPL ~/packages/julias/julia-1.9/share/julia/stdlib/v1.9/REPL/src/REPL.jl:287
 [19] with_repl_linfo(f::Any, repl::REPL.LineEditREPL)
    @ REPL ~/packages/julias/julia-1.9/share/julia/stdlib/v1.9/REPL/src/REPL.jl:557
 [20] print_response(repl::REPL.AbstractREPL, response::Any, show_value::Bool, have_color::Bool)
    @ REPL ~/packages/julias/julia-1.9/share/julia/stdlib/v1.9/REPL/src/REPL.jl:285
 [21] (::REPL.var"#do_respond#80"{Bool, Bool, REPL.var"#93#103"{REPL.LineEditREPL, REPL.REPLHistoryProvider}, REPL.LineEditREPL, REPL.LineEdit.Prompt})(s::REPL.LineEdit.MIState, buf::Any, ok::Bool)
    @ REPL ~/packages/julias/julia-1.9/share/julia/stdlib/v1.9/REPL/src/REPL.jl:899
 [22] #invokelatest#2
    @ ./essentials.jl:816 [inlined]
 [23] invokelatest
    @ ./essentials.jl:813 [inlined]
 [24] run_interface(terminal::REPL.Terminals.TextTerminal, m::REPL.LineEdit.ModalInterface, s::REPL.LineEdit.MIState)
    @ REPL.LineEdit ~/packages/julias/julia-1.9/share/julia/stdlib/v1.9/REPL/src/LineEdit.jl:2647
 [25] run_frontend(repl::REPL.LineEditREPL, backend::REPL.REPLBackendRef)
    @ REPL ~/packages/julias/julia-1.9/share/julia/stdlib/v1.9/REPL/src/REPL.jl:1300
 [26] (::REPL.var"#62#68"{REPL.LineEditREPL, REPL.REPLBackendRef})()
    @ REPL ./task.jl:514

However, this works:

julia> D = Diagonal(Float64[1:4;]);

julia> S = StructArray{ComplexF64}((D, D));

julia> ComplexF64.(S)
4×4 Diagonal{ComplexF64, Vector{ComplexF64}}:
 1.0+1.0im      ⋅          ⋅          ⋅    
     ⋅      2.0+2.0im      ⋅          ⋅    
     ⋅          ⋅      3.0+3.0im      ⋅    
     ⋅          ⋅          ⋅      4.0+4.0im

Reproduce the issue with StructArrays, SparseArrays, and the ComplexF64.(S) broadcast shown in the report, then compare it with the working Diagonal case. Trace the broadcast and eltype handling that produces SparseMatrixCSC{Any}; done means the sparse case infers the expected element type and no longer fails when displayed.