diff --git a/server/services/previewDeploy.js b/server/services/previewDeploy.js
index 472a177..e3698b9 100644
--- a/server/services/previewDeploy.js
+++ b/server/services/previewDeploy.js
@@ -661,7 +661,7 @@ async function followRun({ repoFullName, project, token, runId, subdomain, job,
       }
       if (run.result === 'dev') {
         await patchProject(repoFullName, project, { ...base, previewState: 'sleeping' })
-        try { await runnerClient.startDev(subdomain, job) } catch (err) {
+        try { await runnerClient.startDev(subdomain, { ...job, mode: 'dev' }) } catch (err) {
           console.error('[previewDeploy] Dev-Registrierung fehlgeschlagen:', err.message)
         }
       } else {
diff --git a/test/previewFinalFixes.test.js b/test/previewFinalFixes.test.js
index f139bbb..8f0c398 100644
--- a/test/previewFinalFixes.test.js
+++ b/test/previewFinalFixes.test.js
@@ -241,3 +241,23 @@ test('Abgleich: Runner nicht erreichbar / Schalter aus wirft nie und ändert nic
   config.previewRunner.enabled = false
   assert.deepEqual(await rec.reconcilePreviews(), { skipped: true })
 })
+
+// ---- R19 ----
+test('R19: Verfolger meldet dev immer mit mode dev; registerDevRound liefert identischen Auftrag', async () => {
+  const { createDocument } = await import('../server/services/appwriteAdmin.js')
+  const envLib = await import('../server/services/previewEnv.js')
+  const doc = await createDocument('websiteProjects', {
+    repoFullName: 'WEBklar/r19', projectName: 'R', subdomain: 'r19', previewMode: 'auto',
+    previewEnv: envLib.encryptEnv({ K: 'wert1234' }, key),
+  }, 'r19')
+  rs.script = done({ result: 'dev', detected: { kind: 'build', pm: 'npm' } })
+  await pd.runDeploy('WEBklar/r19', 'main', { subdomain: 'r19', type: 'static', branch: 'main' }, { project: doc, sha: SHA })
+  await pd.waitForRunFollowers()
+  assert.equal(rs.calls.find((c) => c.method === 'POST' && c.url === '/jobs/build').body.mode, 'auto')
+  const first = rs.calls.find((c) => c.method === 'PUT' && c.url === '/dev/r19').body
+  assert.equal(first.mode, 'dev')
+  rs.calls = []
+  await pd.registerDevRound([aw.get('websiteProjects', 'r19')])
+  const second = rs.calls.find((c) => c.method === 'PUT' && c.url === '/dev/r19').body
+  assert.deepEqual(second, first)
+})