diff --git a/ilsp/bicep_lsp/proxy.py b/ilsp/bicep_lsp/proxy.py
index c691bad..f16ddfd 100644
--- a/ilsp/bicep_lsp/proxy.py
+++ b/ilsp/bicep_lsp/proxy.py
@@ -202,14 +202,24 @@ def _inject_completions(msg: dict[str, Any], context: dict | None = None) -> byt
         lru_items = BicepModuleCatalog.as_completion_items()
 
     if lru_items:
-        for item in items:
-            st = item.get("sortText", item.get("label", ""))
-            item["sortText"] = f"1_az_{st}"
-        if isinstance(result, list):
-            msg["result"] = lru_items + items
+        if ctx_type in ("version", "param", "param_value"):
+            # Replace LS completions entirely — the Bicep LS doesn't know about
+            # the private registry, so its suggestions here are noise/random.
+            if isinstance(result, list):
+                msg["result"] = lru_items
+            else:
+                result["items"] = lru_items
+                result["isIncomplete"] = False
         else:
-            result["items"] = lru_items + items
-            result["isIncomplete"] = True
+            # module_path / unknown: keep LS completions below ours
+            for item in items:
+                st = item.get("sortText", item.get("label", ""))
+                item["sortText"] = f"1_az_{st}"
+            if isinstance(result, list):
+                msg["result"] = lru_items + items
+            else:
+                result["items"] = lru_items + items
+                result["isIncomplete"] = True
 
     return json.dumps(msg).encode()
 
diff --git a/tests/test_proxy.py b/tests/test_proxy.py
index fff9e32..5b16fdb 100644
--- a/tests/test_proxy.py
+++ b/tests/test_proxy.py
@@ -102,9 +102,9 @@ def test_version_completions_injected_on_version_context():
     assert "1.1.x" in labels
     assert "2.0.x" in labels
     assert "latest" in labels
-    # LRU versions come first
-    assert items[0]["sortText"].startswith("0_lru_ver_")
-    assert items[-1]["sortText"].startswith("1_az_")
+    # LS items are replaced entirely — private registry versions only
+    assert all(i["sortText"].startswith("0_lru_ver_") for i in items)
+    assert not any(i["label"] == "az-builtin" for i in items)
 
 
 def test_version_items_include_param_detail():
@@ -366,9 +366,8 @@ def test_param_value_injected_in_completion_response():
            "param": "environmentType", "has_open_quote": False}
     out = json.loads(_inject_completions(msg, ctx))
     labels = [i["label"] for i in out["result"]["items"]]
-    # LRU enum values should be first
-    assert labels[:3] == ["DEV", "TEST", "PROD"]
-    assert "existing" in labels
+    # LRU enum values only — LS completions are replaced entirely
+    assert labels == ["DEV", "TEST", "PROD"]
 
 
 def test_detect_unknown_context_outside_module():