diff --git a/Project.toml b/Project.toml
index c0dd5e7..a5edb83 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "PreallocationTools"
 uuid = "d236fae5-4411-538c-8e31-a6e3d9e00b46"
 authors = ["Chris Rackauckas <accounts@chrisrackauckas.com>"]
-version = "0.4.14"
+version = "0.4.15"
 
 [deps]
 Adapt = "79e6a3ab-5dfb-504d-930d-738a2a938a0e"
@@ -10,9 +10,11 @@ ForwardDiff = "f6369f11-7733-5829-9624-2563aa707210"
 
 [weakdeps]
 ReverseDiff = "37e2e3b7-166d-5795-8a7a-e32c996b4267"
+Symbolics = "0c5d862f-8b57-4792-8d23-62f2024744c7"
 
 [extensions]
 PreallocationToolsReverseDiffExt = "ReverseDiff"
+PreallocationToolsSymbolicsExt = "Symbolics"
 
 [compat]
 Adapt = "3.4, 4"
diff --git a/ext/PreallocationToolsSymbolicsExt.jl b/ext/PreallocationToolsSymbolicsExt.jl
new file mode 100644
index 0000000..3b3a24d
--- /dev/null
+++ b/ext/PreallocationToolsSymbolicsExt.jl
@@ -0,0 +1,49 @@
+module PreallocationToolsSymbolicsExt
+
+using PreallocationTools
+import PreallocationTools: _restructure, get_tmp
+using Symbolics, ForwardDiff
+
+function get_tmp(dc::DiffCache, u::Type{X}) where {T,N, X<: ForwardDiff.Dual{T, Num, N}}
+    if length(dc.du) > length(dc.any_du)
+        resize!(dc.any_du, length(dc.du))
+    end
+    _restructure(dc.du, dc.any_du)
+end
+
+function get_tmp(dc::DiffCache, u::X) where {T,N, X<: ForwardDiff.Dual{T, Num, N}}
+    if length(dc.du) > length(dc.any_du)
+        resize!(dc.any_du, length(dc.du))
+    end
+    _restructure(dc.du, dc.any_du)
+end
+
+function get_tmp(dc::DiffCache, u::AbstractArray{X}) where {T,N, X<: ForwardDiff.Dual{T, Num, N}}
+    if length(dc.du) > length(dc.any_du)
+        resize!(dc.any_du, length(dc.du))
+    end
+    _restructure(dc.du, dc.any_du)
+end
+
+function get_tmp(dc::FixedSizeDiffCache, u::Type{X}) where {T,N, X<: ForwardDiff.Dual{T, Num, N}}
+    if length(dc.du) > length(dc.any_du)
+        resize!(dc.any_du, length(dc.du))
+    end
+    _restructure(dc.du, dc.any_du)
+end
+
+function get_tmp(dc::FixedSizeDiffCache, u::X) where {T,N, X<: ForwardDiff.Dual{T, Num, N}}
+    if length(dc.du) > length(dc.any_du)
+        resize!(dc.any_du, length(dc.du))
+    end
+    _restructure(dc.du, dc.any_du)
+end
+
+function get_tmp(dc::FixedSizeDiffCache, u::AbstractArray{X}) where {T,N, X<: ForwardDiff.Dual{T, Num, N}}
+    if length(dc.du) > length(dc.any_du)
+        resize!(dc.any_du, length(dc.du))
+    end
+    _restructure(dc.du, dc.any_du)
+end
+
+end
diff --git a/src/PreallocationTools.jl b/src/PreallocationTools.jl
index c5ca91a..d0f4425 100644
--- a/src/PreallocationTools.jl
+++ b/src/PreallocationTools.jl
@@ -75,6 +75,17 @@ function get_tmp(dc::FixedSizeDiffCache, u::Union{Number, AbstractArray})
     end
 end
 
+function get_tmp(dc::FixedSizeDiffCache, ::Type{T}) where T <: Number
+    if promote_type(eltype(dc.du), T) <: eltype(dc.du)
+        dc.du
+    else
+        if length(dc.du) > length(dc.any_du)
+            resize!(dc.any_du, length(dc.du))
+        end
+        _restructure(dc.du, dc.any_du)
+    end
+end
+
 # DiffCache
 
 struct DiffCache{T <: AbstractArray, S <: AbstractArray}
@@ -125,7 +136,7 @@ function get_tmp(dc::DiffCache, u::T) where {T <: ForwardDiff.Dual}
     _restructure(dc.du, reinterpret(T, view(dc.dual_du, 1:nelem)))
 end
 
-function get_tmp(dc::DiffCache, u::Type{T}) where {T <: ForwardDiff.Dual}
+function get_tmp(dc::DiffCache, ::Type{T}) where {T <: ForwardDiff.Dual}
     nelem = div(sizeof(T), sizeof(eltype(dc.dual_du))) * length(dc.du)
     if nelem > length(dc.dual_du)
         enlargediffcache!(dc, nelem)
@@ -153,6 +164,18 @@ function get_tmp(dc::DiffCache, u::Union{Number, AbstractArray})
     end
 end
 
+function get_tmp(dc::DiffCache, ::Type{T}) where T <: Number
+    if promote_type(eltype(dc.du), T) <: eltype(dc.du)
+        dc.du
+    else
+        if length(dc.du) > length(dc.any_du)
+            resize!(dc.any_du, length(dc.du))
+        end
+
+        _restructure(dc.du, dc.any_du)
+    end
+end
+
 get_tmp(dc, u) = dc
 
 function _restructure(normal_cache::Array, duals)
diff --git a/test/core_odes.jl b/test/core_odes.jl
index 8653a7d..239128b 100644
--- a/test/core_odes.jl
+++ b/test/core_odes.jl
@@ -4,7 +4,7 @@ using LinearAlgebra,
 
 #Base array
 function foo(du, u, (A, tmp), t)
-    tmp = get_tmp(tmp, u)
+    tmp = get_tmp(tmp, promote_type(eltype(u), typeof(t)))
     mul!(tmp, A, u)
     @. du = u + tmp
     nothing
@@ -15,23 +15,23 @@ u0 = ones(5, 5)
 A = ones(5, 5)
 cache = DiffCache(zeros(5, 5), chunk_size)
 prob = ODEProblem{true, SciMLBase.FullSpecialize}(foo, u0, (0.0, 1.0), (A, cache))
-sol = solve(prob, TRBDF2(chunk_size = chunk_size))
+sol = solve(prob, Rodas5P(chunk_size = chunk_size))
 @test sol.retcode == ReturnCode.Success
 
 cache = FixedSizeDiffCache(zeros(5, 5), chunk_size)
 prob = ODEProblem{true, SciMLBase.FullSpecialize}(foo, u0, (0.0, 1.0), (A, cache))
-sol = solve(prob, TRBDF2(chunk_size = chunk_size))
+sol = solve(prob, Rodas5P(chunk_size = chunk_size))
 @test sol.retcode == ReturnCode.Success
 
 #with auto-detected chunk_size
 cache = DiffCache(zeros(5, 5))
 prob = ODEProblem{true, SciMLBase.FullSpecialize}(foo, ones(5, 5), (0.0, 1.0), (A, cache))
-sol = solve(prob, TRBDF2())
+sol = solve(prob, Rodas5P())
 @test sol.retcode == ReturnCode.Success
 
 prob = ODEProblem(foo, ones(5, 5), (0.0, 1.0),
     (ones(5, 5), FixedSizeDiffCache(zeros(5, 5))))
-sol = solve(prob, TRBDF2())
+sol = solve(prob, Rodas5P())
 @test sol.retcode == ReturnCode.Success
 
 #Base array with LBC
@@ -43,7 +43,7 @@ function foo(du, u, (A, lbc), t)
 end
 prob = ODEProblem{true, SciMLBase.FullSpecialize}(foo, ones(5, 5), (0.0, 1.0),
     (ones(5, 5), LazyBufferCache()))
-sol = solve(prob, TRBDF2())
+sol = solve(prob, Rodas5P())
 @test sol.retcode == ReturnCode.Success
 
 #LArray
@@ -60,9 +60,9 @@ end
 chunk_size = 4
 prob = ODEProblem{true, SciMLBase.FullSpecialize}(foo, u0, (0.0, 1.0),
     (A, DiffCache(c, chunk_size)))
-sol = solve(prob, TRBDF2(chunk_size = chunk_size))
+sol = solve(prob, Rodas5P(chunk_size = chunk_size))
 @test sol.retcode == ReturnCode.Success
 #with auto-detected chunk_size
 prob = ODEProblem{true, SciMLBase.FullSpecialize}(foo, u0, (0.0, 1.0), (A, DiffCache(c)))
-sol = solve(prob, TRBDF2())
+sol = solve(prob, Rodas5P())
 @test sol.retcode == ReturnCode.Success
diff --git a/test/sparsity_support.jl b/test/sparsity_support.jl
index b53273c..e6eba6d 100644
--- a/test/sparsity_support.jl
+++ b/test/sparsity_support.jl
@@ -48,3 +48,26 @@ A = Symbolics.jacobian_sparsity(wrap_res_dae_cache!, output, x0)
 B = sparse([1 0; 0 1])
 @test A == B
 @test findnz(A) == findnz(B)
+
+# Test Nesting https://discourse.julialang.org/t/preallocationtools-jl-with-nested-forwarddiff-and-sparsity-pattern-detection-errors/107897
+
+function foo(x, cache)
+    d = get_tmp(cache, x)
+
+    d[:] = x
+
+    0.5 * x'*x
+end
+
+function residual(r, x, cache)
+    function foo_wrap(x)
+        foo(x, cache)
+    end
+
+    r[:] = ForwardDiff.gradient(foo_wrap, x)
+end
+
+cache = DiffCache(zeros(2))
+pattern = Symbolics.jacobian_sparsity((r, x) -> residual(r, x, cache), zeros(2), zeros(2))
+@test pattern == sparse([1 0
+                         0 1])