--- a/packages/runner/src/executor/space-server.ts
+++ b/packages/runner/src/executor/space-server.ts
@@ -3046,7 +3046,7 @@
         // Deferral is a BARRIER, not a skip: everything at or behind
         // this entry's arrival position waits with it, or a later
         // arrival's consequence lands ahead of an earlier one.
-        this.#eventVisibilityFloor = entry.seq ?? 1;
+        this.#eventVisibilityFloor = undefined;
         this.#notePreQueueDeferral(
           doc.id,
           () => `sidecar ${doc.id} (sync failing)`,
@@ -3133,7 +3133,7 @@
             // The same barrier as above: the deferred entry's
             // still-catching-up view must not let later arrivals run
             // ahead of it.
-            this.#eventVisibilityFloor = entry.seq ?? 1;
+            this.#eventVisibilityFloor = undefined;
             this.#notePreQueueDeferral(
               entry.eventId,
               () => `event ${entry.eventId} (replica view lagging)`,