diff --git a/lightningd/dual_open_control.c b/lightningd/dual_open_control.c
index 7f1d50993..279c4bb96 100644
--- a/lightningd/dual_open_control.c
+++ b/lightningd/dual_open_control.c
@@ -437,8 +437,23 @@ openchannel2_hook_deserialize(struct openchannel2_payload *payload,
 		      json_tok_full(buffer, toks));
 
 	if (json_tok_streq(buffer, t_result, "reject")) {
+		/* Should not have set any other fields if 'reject'ing */
+		if (json_get_member(buffer, toks, "close_to"))
+			fatal("Plugin rejected openchannel2 but"
+			      " also set close_to");
+		if (json_get_member(buffer, toks, "psbt"))
+			fatal("Plugin rejected openchannel2 but"
+			      " also set `psbt`");
+		if (json_get_member(buffer, toks, "accepter_funding_msat"))
+			fatal("Plugin rejected openchannel2 but"
+			      " also set `accepter_funding_psbt`");
+		if (json_get_member(buffer, toks, "funding_feerate"))
+			fatal("Plugin rejected openchannel2 but"
+			      " also set `funding_feerate`");
+
 		const jsmntok_t *t_errmsg = json_get_member(buffer, toks,
 							    "error_message");
+
 		if (t_errmsg)
 			payload->err_msg = json_strdup(payload,
 						       buffer, t_errmsg);
diff --git a/tests/test_plugin.py b/tests/test_plugin.py
index 7af79f40e..e110b7349 100644
--- a/tests/test_plugin.py
+++ b/tests/test_plugin.py
@@ -625,9 +625,9 @@ def test_openchannel_hook_error_handling(node_factory, bitcoind):
     l1.fundwallet(10**6)
 
     # next fundchannel should fail fatal() for l2
-    with pytest.raises(RpcError, match=r'Owning subdaemon openingd died'):
+    with pytest.raises(RpcError, match=r'Owning subdaemon (openingd|dualopend) died'):
         l1.rpc.fundchannel(l2.info['id'], 100004)
-    assert l2.daemon.is_in_log("BROKEN.*Plugin rejected openchannel but also set close_to")
+    assert l2.daemon.is_in_log("BROKEN.*Plugin rejected openchannel[2]? but also set close_to")
 
 
 def test_openchannel_hook_chaining(node_factory, bitcoind):