diff --git a/gateway/stream_consumer_fallback.py b/gateway/stream_consumer_fallback.py
index 21df1e5330..44ca80fae5 100644
--- a/gateway/stream_consumer_fallback.py
+++ b/gateway/stream_consumer_fallback.py
@@ -121,9 +121,12 @@ class StreamFallbackMixin:
         last_message_id: Optional[str] = None
         last_successful_chunk = ""
         sent_any_chunk = False
+        # Thread only a FULL resend (it replaces the preview); a tail continuation
+        # keeps its existing unthreaded delivery on every platform.
+        anchor = self._initial_reply_to_id if continuation == final_text else None
         for chunk in chunks:
             result = await self._send_with_flood_retry(
-                content=chunk, reply_to=self._initial_reply_to_id,
+                content=chunk, reply_to=None if sent_any_chunk else anchor,
                 retry_log="Flood control on fallback send, retrying in %.1fs")
             if not result or not result.success:
                 # Partial continuation landed: do NOT set _final_response_sent (the