diff --git a/src/static/tests/SigSelectSpec.js b/src/static/tests/SigSelectSpec.js
index a467eaa..2e6d519 100644
--- a/src/static/tests/SigSelectSpec.js
+++ b/src/static/tests/SigSelectSpec.js
@@ -919,6 +919,25 @@ describe("SigSelect", () => {
             takeSigBtn = document.getElementById("id_take_sig_btn");
             expect(takeSigBtn.textContent).toBe("WAIT NVM");
         });
+
+        it("re-renders the numeral when countdown_start arrives again after a cancel", () => {
+            // Diagnostic for the re-ready bug: cancel → re-ready must restart the
+            // visual countdown. This exercises the CLIENT handler chain only; if
+            // it passes, the live failure is WS delivery (socket / broadcast), not
+            // client logic.
+            makeFixture({ reservations: '{"42":"PC"}', ready: true, countdownRemaining: 9 });
+            takeSigBtn = document.getElementById("id_take_sig_btn");
+            expect(takeSigBtn.textContent).toBe("9");                       // counting
+            window.dispatchEvent(new CustomEvent("room:countdown_cancel", {
+                detail: { polarity: "levity", seconds_remaining: 7 },
+            }));
+            expect(takeSigBtn.textContent).toBe("WAIT NVM");                // cancelled
+            window.dispatchEvent(new CustomEvent("room:countdown_start", {
+                detail: { polarity: "levity", seconds: 7 },
+            }));
+            expect(takeSigBtn.textContent).toBe("7");                       // restarted
+            expect(takeSigBtn.classList.contains("sig-take-sig-btn--counting")).toBe(true);
+        });
     });
 
     // ── polarity_room_done → tray sequence ─────────────────────────────────── //
diff --git a/src/static_src/tests/SigSelectSpec.js b/src/static_src/tests/SigSelectSpec.js
index a467eaa..2e6d519 100644
--- a/src/static_src/tests/SigSelectSpec.js
+++ b/src/static_src/tests/SigSelectSpec.js
@@ -919,6 +919,25 @@ describe("SigSelect", () => {
             takeSigBtn = document.getElementById("id_take_sig_btn");
             expect(takeSigBtn.textContent).toBe("WAIT NVM");
         });
+
+        it("re-renders the numeral when countdown_start arrives again after a cancel", () => {
+            // Diagnostic for the re-ready bug: cancel → re-ready must restart the
+            // visual countdown. This exercises the CLIENT handler chain only; if
+            // it passes, the live failure is WS delivery (socket / broadcast), not
+            // client logic.
+            makeFixture({ reservations: '{"42":"PC"}', ready: true, countdownRemaining: 9 });
+            takeSigBtn = document.getElementById("id_take_sig_btn");
+            expect(takeSigBtn.textContent).toBe("9");                       // counting
+            window.dispatchEvent(new CustomEvent("room:countdown_cancel", {
+                detail: { polarity: "levity", seconds_remaining: 7 },
+            }));
+            expect(takeSigBtn.textContent).toBe("WAIT NVM");                // cancelled
+            window.dispatchEvent(new CustomEvent("room:countdown_start", {
+                detail: { polarity: "levity", seconds: 7 },
+            }));
+            expect(takeSigBtn.textContent).toBe("7");                       // restarted
+            expect(takeSigBtn.classList.contains("sig-take-sig-btn--counting")).toBe(true);
+        });
     });
 
     // ── polarity_room_done → tray sequence ─────────────────────────────────── //