@@ -75,6 +75,23 @@ describe("config clobber snapshots", () => {
7575}
7676}
777778+function touchClobberFilesByContentOrderSync(configPath: string): void {
79+const dir = path.dirname(configPath);
80+const prefix = `${path.basename(configPath)}.clobbered.`;
81+for (const entry of fs.readdirSync(dir)) {
82+if (!entry.startsWith(prefix)) {
83+continue;
84+}
85+const targetPath = path.join(dir, entry);
86+const match = /^polluted-(\d+)\n$/.exec(fs.readFileSync(targetPath, "utf-8"));
87+if (!match) {
88+continue;
89+}
90+const touchedAt = new Date(`2026-05-03T00:00:${match[1].padStart(2, "0")}.000Z`);
91+fs.utimesSync(targetPath, touchedAt, touchedAt);
92+}
93+}
94+7895it("keeps concurrent async snapshots under the per-path cap by rotating oldest files", async () => {
7996await withCase(async (configPath) => {
8097const warn = vi.fn();
@@ -227,4 +244,42 @@ describe("config clobber snapshots", () => {
227244expect(capWarnings).toHaveLength(1);
228245});
229246});
247+248+it("keeps rotating same-timestamp sync snapshots after the base artifact is reused", async () => {
249+await withCase(async (configPath) => {
250+const warn = vi.fn();
251+const observedAt = "2026-05-03T00:00:00.000Z";
252+253+for (let index = 0; index < CONFIG_CLOBBER_SNAPSHOT_LIMIT; index++) {
254+persistBoundedClobberedConfigSnapshotSync({
255+deps: { fs, logger: { warn } },
256+ configPath,
257+raw: `polluted-${index}\n`,
258+ observedAt,
259+});
260+}
261+touchClobberFilesByContentOrderSync(configPath);
262+263+for (
264+let index = CONFIG_CLOBBER_SNAPSHOT_LIMIT;
265+index < CONFIG_CLOBBER_SNAPSHOT_LIMIT + 3;
266+index++
267+) {
268+persistBoundedClobberedConfigSnapshotSync({
269+deps: { fs, logger: { warn } },
270+ configPath,
271+raw: `polluted-${index}\n`,
272+ observedAt,
273+});
274+}
275+276+const clobberFiles = await listClobberFiles(configPath);
277+expect(clobberFiles).toHaveLength(CONFIG_CLOBBER_SNAPSHOT_LIMIT);
278+const contents = await readClobberFileContents(configPath);
279+expect(contents).not.toContain("polluted-0\n");
280+expect(contents).not.toContain("polluted-1\n");
281+expect(contents).not.toContain("polluted-2\n");
282+expect(contents).toContain(`polluted-${CONFIG_CLOBBER_SNAPSHOT_LIMIT + 2}\n`);
283+});
284+});
230285});
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