From 4d83a2219aa2577fd8d00621e0c2d75f14159518 Mon Sep 17 00:00:00 2001
From: Aayush Sabharwal <aayush.sabharwal@gmail.com>
Date: Sat, 26 Jul 2025 22:11:43 +0530
Subject: [PATCH 1/4] fix: fix type-instability of `get_root_indp`

---
 src/solutions/save_idxs.jl | 28 +++++++++++++++++++++++-----
 1 file changed, 23 insertions(+), 5 deletions(-)

diff --git a/src/solutions/save_idxs.jl b/src/solutions/save_idxs.jl
index 6e4afbd33..7a2db44e6 100644
--- a/src/solutions/save_idxs.jl
+++ b/src/solutions/save_idxs.jl
@@ -44,12 +44,30 @@ function as_diffeq_array(vt::Vector{VectorTemplate}, t)
     return DiffEqArray(typeof(TupleOfArraysWrapper(vt))[], t, (1, 1))
 end
 
-function get_root_indp(indp)
-    if hasmethod(symbolic_container, Tuple{typeof(indp)}) &&
-       (sc = symbolic_container(indp)) !== indp
-        return get_root_indp(sc)
+function get_root_indp(prob::AbstractSciMLProblem)
+    get_root_indp(prob.f)
+end
+
+function get_root_indp(f::T) where {T <: AbstractSciMLFunction}
+    if hasfield(T, :sys)
+        return f.sys
+    elseif hasfield(T, :f) && f.f isa AbstractSciMLFunction
+        return get_root_indp(f.f)
+    else
+        return nothing
     end
-    return indp
+end
+
+function get_root_indp(prob::LinearProblem)
+    get_root_indp(prob.f)
+end
+
+get_root_indp(prob::AbstractJumpProblem) = get_root_indp(prob.prob)
+
+get_root_indp(x) = x
+
+function get_root_indp(f::SymbolicLinearInterface)
+    get_root_indp(f.sys)
 end
 
 # Everything from this point on is public API

From 3393e16eb0b43f8e1498cb9a224c090b15ca172c Mon Sep 17 00:00:00 2001
From: Aayush Sabharwal <aayush.sabharwal@gmail.com>
Date: Fri, 24 Oct 2025 17:26:23 +0530
Subject: [PATCH 2/4] test: `init(::SteadyStateProblem)` now works

---
 test/downstream/comprehensive_indexing.jl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/downstream/comprehensive_indexing.jl b/test/downstream/comprehensive_indexing.jl
index cd01bb4b4..41ac6135f 100644
--- a/test/downstream/comprehensive_indexing.jl
+++ b/test/downstream/comprehensive_indexing.jl
@@ -83,7 +83,7 @@ begin
     sint = init(sprob, ImplicitEM(); save_everystep = false)
     jint = init(jprob, SSAStepper())
     nint = init(nprob, NewtonRaphson(); save_everystep = false)
-    @test_broken ssint = init(ssprob, DynamicSS(Tsit5()); save_everystep = false) # https://github.com/SciML/SteadyStateDiffEq.jl/issues/79
+    ssint = init(ssprob, DynamicSS(Tsit5()); save_everystep = false)
     integrators = [oint, sint, jint, nint]
     integsystems = [osys, ssys, jsys, nsys]
 

From dd507193d094745891d8fe055c62a902083555b7 Mon Sep 17 00:00:00 2001
From: Aayush Sabharwal <aayush.sabharwal@gmail.com>
Date: Fri, 24 Oct 2025 17:40:47 +0530
Subject: [PATCH 3/4] test: only run Zygote tests below Julia 1.12

---
 test/runtests.jl | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/test/runtests.jl b/test/runtests.jl
index 8ab4b657d..0b91d06c1 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -95,8 +95,10 @@ end
         @time @safetestset "Integer idxs" begin
             include("downstream/integer_idxs.jl")
         end
-        @time @safetestset "Autodiff Remake" begin
-            include("downstream/remake_autodiff.jl")
+        if VERSION < v"1.12" # Zygote is incredibly broken on 1.12
+            @time @safetestset "Autodiff Remake" begin
+                include("downstream/remake_autodiff.jl")
+            end
         end
         @time @safetestset "Partial Functions" begin
             include("downstream/partial_functions.jl")
@@ -134,8 +136,10 @@ end
         @time @safetestset "Problem Indexing" begin
             include("downstream/problem_interface.jl")
         end
-        @time @safetestset "Adjoints" begin
-            include("downstream/adjoints.jl")
+        if VERSION < v"1.12" # Zygote is incredibly broken on 1.12
+            @time @safetestset "Adjoints" begin
+                include("downstream/adjoints.jl")
+            end
         end
         @time @safetestset "ModelingToolkit Remake" begin
             include("downstream/modelingtoolkit_remake.jl")

From ebfe98347a52e2b5b7a6b4d1fc83ea7c7f59f259 Mon Sep 17 00:00:00 2001
From: Aayush Sabharwal <aayush.sabharwal@gmail.com>
Date: Fri, 24 Oct 2025 18:46:29 +0530
Subject: [PATCH 4/4] test: import SciMLSensitivity in test

---
 test/downstream/observables_autodiff.jl | 1 +
 1 file changed, 1 insertion(+)

diff --git a/test/downstream/observables_autodiff.jl b/test/downstream/observables_autodiff.jl
index 537a81bdb..222ca8e7f 100644
--- a/test/downstream/observables_autodiff.jl
+++ b/test/downstream/observables_autodiff.jl
@@ -5,6 +5,7 @@ import SymbolicIndexingInterface as SII
 import SciMLStructures as SS
 using ModelingToolkitStandardLibrary
 import ModelingToolkitStandardLibrary as MSL
+using SciMLSensitivity
 
 @parameters σ ρ β
 @variables x(t) y(t) z(t) w(t)