diff --git a/lib/OrdinaryDiffEqFunctionMap/test/discrete_algorithm_test.jl b/lib/OrdinaryDiffEqFunctionMap/test/discrete_algorithm_test.jl
index ce63f45703..99c154f3f5 100644
--- a/lib/OrdinaryDiffEqFunctionMap/test/discrete_algorithm_test.jl
+++ b/lib/OrdinaryDiffEqFunctionMap/test/discrete_algorithm_test.jl
@@ -63,3 +63,17 @@ end
 
     @test sol3.u == [[0, 0], [1, 1], [2, 3], [3, 6], [4, 10], [5, 15]]
 end
+
+@testset "FunctionMap keyword validation" begin
+    current_limiter!(u, integrator, p, t) = nothing
+    legacy_limiter!(u, integrator, p, t) = nothing
+
+    @test FunctionMap(step_limiter = current_limiter!).step_limiter! === current_limiter!
+    @test FunctionMap(; step_limiter! = legacy_limiter!).step_limiter! === legacy_limiter!
+    @test_throws ArgumentError("Unsupported keyword argument(s): (:unsupported,)") FunctionMap(
+        unsupported = true
+    )
+    @test_throws ArgumentError(
+        "Unsupported keyword argument(s): (:unsupported, :also_unsupported)"
+    ) FunctionMap(unsupported = true, also_unsupported = true)
+end
diff --git a/lib/OrdinaryDiffEqFunctionMap/test/qa/qa.jl b/lib/OrdinaryDiffEqFunctionMap/test/qa/qa.jl
index 5ec4e434da..40e68e930b 100644
--- a/lib/OrdinaryDiffEqFunctionMap/test/qa/qa.jl
+++ b/lib/OrdinaryDiffEqFunctionMap/test/qa/qa.jl
@@ -12,9 +12,14 @@ run_qa(
             # OrdinaryDiffEqCore owner-internal no-op limiter (deliberately not public).
             ignore = (:trivial_limiter!,),
         ),
-        # SciMLBase-owned default-solve sentinels; non-public in SciMLBase.
         all_qualified_accesses_are_public = (;
-            ignore = (:DISCRETE_INPLACE_DEFAULT, :DISCRETE_OUTOFPLACE_DEFAULT),
+            ignore = (
+                # SciMLBase-owned default-solve sentinels; non-public in SciMLBase.
+                :DISCRETE_INPLACE_DEFAULT,
+                :DISCRETE_OUTOFPLACE_DEFAULT,
+                # Preserves the statically known NamedTuple type after field removal.
+                :structdiff,
+            ),
         ),
     ),
 )