diff --git a/tests/comfyui/execution-history.spec.mjs b/tests/comfyui/execution-history.spec.mjs
index eab2b16e..ec579e6a 100644
--- a/tests/comfyui/execution-history.spec.mjs
+++ b/tests/comfyui/execution-history.spec.mjs
@@ -314,6 +314,16 @@ test('fresh registered PM variants preserve exact raw whitespace and known empty
         const runId = (await readExecutionRuns(execution.databasePath, id)).rows[0].run_id;
         const response = await execution.request.get(`/prompt_manager/library/${value.positive_prompt_id}/history`);expect(response.ok()).toBe(true);
         expect((await response.json()).items.map(item => item.run_id)).toContain(runId);
+        if (kind !== 'PromptManager') continue;
+        // #460: an upper-case re-queue counts toward the same prompt and joins its history
+        const upper = await submit(execution.request, recipeGraph({ kind, text: `${kind.toUpperCase()} E\u0301` }));
+        await history(execution.request, upper);
+        const variant = (await capture(execution, upper)).contexts[0];
+        expect(variant.positive.raw).toBe(`${kind.toUpperCase()} E\u0301`);
+        expect(variant.positive_prompt_id, 'the case variant names the same prompt').toBe(value.positive_prompt_id);
+        const variantRun = (await readExecutionRuns(execution.databasePath, upper)).rows[0].run_id;
+        const scoped = await execution.request.get(`/prompt_manager/library/${value.positive_prompt_id}/history`);
+        expect((await scoped.json()).items.map(item => item.run_id)).toContain(variantRun);
     }
 });