diff --git a/tests/test_opening.py b/tests/test_opening.py
index cdf069cb6eca..f528eb6801a5 100644
--- a/tests/test_opening.py
+++ b/tests/test_opening.py
@@ -1571,12 +1571,24 @@ def censoring_sendrawtx(r):
 
     # Make a 3rd inflight that won't make it into the mempool
     signed_psbt = run_retry()
-    last = len(l1.daemon.logs)
+    # Snapshot the logs only after catching up: len(logs) does not read
+    # new output, so a stale snapshot would match the *2nd* inflight's
+    # "sendrawtx exit 0" and we'd unmock before the 3rd is broadcast.
+    l1.daemon.logs_catchup()
+    l2.daemon.logs_catchup()
+    last1 = len(l1.daemon.logs)
+    last2 = len(l2.daemon.logs)
     l1.rpc.openchannel_signed(chan_id, signed_psbt)
 
-    wait_for(lambda: l1.daemon.is_in_log("plugin-bcli: sendrawtx exit 0", start=last))
+    # Both nodes broadcast the (censored) funding tx, and either request
+    # may still be in flight, so wait for both before unmocking: otherwise
+    # the still-mocked attempt would be forwarded for real and replace the
+    # 2nd inflight in the mempool.
+    wait_for(lambda: l1.daemon.is_in_log("plugin-bcli: sendrawtx exit 0", start=last1))
+    wait_for(lambda: l2.daemon.is_in_log("plugin-bcli: sendrawtx exit 0", start=last2))
     import time
-    time.sleep(.05)
+
+    time.sleep(0.05)
 
     l1.daemon.rpcproxy.mock_rpc('sendrawtransaction', None)
     l2.daemon.rpcproxy.mock_rpc('sendrawtransaction', None)
@@ -1686,11 +1698,22 @@ def censoring_sendrawtx(r):
 
     # Make a 3rd inflight that won't make it into the mempool
     signed_psbt = run_retry()
-    last = len(l1.daemon.logs)
+    # Snapshot the logs only after catching up: len(logs) does not read
+    # new output, so a stale snapshot would match the *2nd* inflight's
+    # "sendrawtx exit 0" and we'd unmock before the 3rd is broadcast.
+    l1.daemon.logs_catchup()
+    l2.daemon.logs_catchup()
+    last1 = len(l1.daemon.logs)
+    last2 = len(l2.daemon.logs)
     l1.rpc.openchannel_signed(chan_id, signed_psbt)
 
-    wait_for(lambda: l1.daemon.is_in_log("plugin-bcli: sendrawtx exit 0", start=last))
-    time.sleep(.05)
+    # Both nodes broadcast the (censored) funding tx, and either request
+    # may still be in flight, so wait for both before unmocking: otherwise
+    # the still-mocked attempt would be forwarded for real and replace the
+    # 2nd inflight in the mempool.
+    wait_for(lambda: l1.daemon.is_in_log("plugin-bcli: sendrawtx exit 0", start=last1))
+    wait_for(lambda: l2.daemon.is_in_log("plugin-bcli: sendrawtx exit 0", start=last2))
+    time.sleep(0.05)
 
     l1.daemon.rpcproxy.mock_rpc('sendrawtransaction', None)
     l2.daemon.rpcproxy.mock_rpc('sendrawtransaction', None)