diff --git a/test/form_test.exs b/test/form_test.exs
index 3d3e6e6..c52f9d7 100644
--- a/test/form_test.exs
+++ b/test/form_test.exs
@@ -552,5 +552,40 @@ defmodule AshPhoenix.FormTest do
       assert [%Phoenix.HTML.Form{source: %AshPhoenix.Form{resource: AshPhoenix.Test.Post}}] =
                inputs_for(form_for(form, "action"), :post)
     end
+
+    test "failing single intermediate form" do
+      post_id = Ash.UUID.generate()
+      comment = %Comment{text: "text", post: %Post{id: post_id, text: "Some text"}}
+
+      form =
+        comment
+        |> Form.for_update(:update,
+          forms: [
+            post: [
+              data: comment.post,
+              type: :single,
+              resource: Post,
+              update_action: :update,
+              create_action: :create,
+              forms: [
+                comments: [
+                  data: & &1.comments,
+                  type: :list,
+                  resource: Comment,
+                  update_action: :update,
+                  create_action: :create
+                ]
+              ]
+            ]
+          ]
+        )
+
+      assert [%Phoenix.HTML.Form{source: %AshPhoenix.Form{resource: AshPhoenix.Test.Post}}] =
+               form
+               |> form_for("action")
+               |> inputs_for(:post)
+               |> hd()
+               |> inputs_for(:comments)
+    end
   end
 end