symbolics_to_sympy fais with BoundError when passing array variable

[lr4d]

e.g.

julia> using Symbolics, SymPy
julia> @variables s[1:2]
1-element Vector{Symbolics.Arr{Num, 1}}:
s[1:2]
julia> eq = s[2] + 3
3 + s[2]
julia> symbolics_to_sympy(eq)
ERROR: BoundsError
Stacktrace:
  [1] getindex(x::Sym, i::Int64)
    @ Base ./number.jl:96
  [2] symbolics_to_sympy(expr::SymbolicUtils.Term{Real, Nothing})
    @ Symbolics ~/.julia/packages/Symbolics/IKB6Q/src/init.jl:17
  [3] iterate
    @ ./generator.jl:47 [inlined]
  [4] collect_to!(dest::Vector{Int64}, itr::Base.Generator{Vector{Any}, typeof(symbolics_to_sympy)}, offs::Int64, st::Int64)
    @ Base ./array.jl:724
  [5] collect_to_with_first!(dest::Vector{Int64}, v1::Int64, itr::Base.Generator{Vector{Any}, typeof(symbolics_to_sympy)}, st::Int64)
    @ Base ./array.jl:702
  [6] _collect(c::Vector{Any}, itr::Base.Generator{Vector{Any}, typeof(symbolics_to_sympy)}, #unused#::Base.EltypeUnknown, isz::Base.HasShape{1})
    @ Base ./array.jl:696
  [7] collect_similar(cont::Vector{Any}, itr::Base.Generator{Vector{Any}, typeof(symbolics_to_sympy)})
    @ Base ./array.jl:606
  [8] map(f::Function, A::Vector{Any})
    @ Base ./abstractarray.jl:2294
  [9] symbolics_to_sympy(expr::Num)
    @ Symbolics ~/.julia/packages/Symbolics/IKB6Q/src/init.jl:13
 [10] top-level scope
    @ REPL[4]:1

Environment:
Julia 1.6.2

(@v1.6) pkg> status Symbolics
      Status `~/.julia/environments/v1.6/Project.toml`
  [0c5d862f] Symbolics v3.3.1

(@v1.6) pkg> status SymPy
      Status `~/.julia/environments/v1.6/Project.toml`
  [24249f21] SymPy v1.0.52

┆Issue is synchronized with this Trello card by Unito

[moble]

A workaround would be to define

s = [Symbolics.variable(:s, i) for i in 1:2]

I don't think this should be necessary, though; see #379.