diff --git a/esphome/yaml_edit.py b/esphome/yaml_edit.py
index 7fe2a35a844..69a6077aff1 100644
--- a/esphome/yaml_edit.py
+++ b/esphome/yaml_edit.py
@@ -106,9 +106,13 @@ def _own_documents() -> set[Path]:
     walk(CORE.raw_config or {})
     # A file that only gave substitutions leaves no node behind; the tracker
     # also lists a secrets file the loader only tried, hence the is_file check
-    documents.update(
-        map(str, yaml_util.discover_user_yaml_files(CORE.config_path).files)
-    )
+    found = yaml_util.discover_user_yaml_files(CORE.config_path)
+    if found.load_errors:  # an incomplete set would misplace a key
+        raise EsphomeError(
+            "Could not read every file of the configuration: "
+            + "; ".join(found.load_errors)
+        )
+    documents.update(map(str, found.files))
     return {p.resolve() for d in documents if (p := Path(d)).is_file()}
 
 
@@ -187,8 +191,12 @@ def rewritten_text(original: str, edits: list[LineEdit]) -> str:
     """``original`` with the edits applied; a line that changed is refused."""
     lines = original.splitlines(keepends=True)
     file_newline = "\r\n" if "\r\n" in original else "\n"
-    # Bottom up, so an insertion never shifts a later edit
-    for edit in sorted(edits, key=lambda e: (e.line, e.insert_after), reverse=True):
+    # Bottom up, so an insertion never shifts a later edit; insertions under
+    # one line keep their order
+    order = sorted(
+        enumerate(edits), key=lambda ie: (ie[1].line, ie[1].insert_after, ie[0])
+    )
+    for _, edit in reversed(order):
         text = lines[edit.line].rstrip("\r\n") if edit.line < len(lines) else None
         if text != edit.old_line:
             raise EsphomeError(f"{edit.path}:{edit.line + 1} changed since it was read")
@@ -218,7 +226,10 @@ def apply_line_edits(edits: list[LineEdit]) -> dict[Path, Snapshot]:
             write_keeping_mode(path, snapshot.written)
         for path in originals:
             try:
-                yaml_util.load_yaml(path, track_document_range=False)
+                # The secret registry stays: later output still redacts
+                yaml_util.load_yaml(
+                    path, clear_secrets=False, track_document_range=False
+                )
             except EsphomeError as err:
                 raise EsphomeError(f"{path} no longer loads: {err}") from err
         compiled_config.invalidate_compiled_config()
diff --git a/tests/unit_tests/test_yaml_edit.py b/tests/unit_tests/test_yaml_edit.py
index 9dd2aef958b..197f4bf3933 100644
--- a/tests/unit_tests/test_yaml_edit.py
+++ b/tests/unit_tests/test_yaml_edit.py
@@ -252,14 +252,38 @@ def test_insert_after_goes_before_the_rewrite_of_the_same_line(
     path = _setup(tmp_path, text)
     edit = _name_edit("garage")
     added = LineEdit(path, 4, "  ssid: kitchen", "  password: x", insert_after=True)
-    assert rewritten_text(read_text(path), [added, edit]) == (
-        text.replace("name: kitchen", "name: garage") + "\r\n  password: x"
+    more = LineEdit(
+        path, 4, "  ssid: kitchen", "  fast_connect: true", insert_after=True
+    )
+    assert rewritten_text(read_text(path), [added, more, edit]) == (
+        text.replace("name: kitchen", "name: garage")
+        + "\r\n  password: x\r\n  fast_connect: true"
     )
     edit.old_line = "changed"
     with pytest.raises(EsphomeError, match="changed since it was read"):
         rewritten_text(read_text(path), [added, edit])
 
 
+def test_own_documents_refuses_an_incomplete_set(tmp_path: Path) -> None:
+    _setup(tmp_path, YAML)
+    found = yaml_util.DiscoveredYamlFiles(load_errors=["sub.yaml: broken"])
+    with (
+        patch("esphome.yaml_util.discover_user_yaml_files", return_value=found),
+        pytest.raises(EsphomeError, match="Could not read every file .*sub.yaml"),
+    ):
+        own_documents()
+
+
+def test_apply_keeps_the_secret_registry(tmp_path: Path) -> None:
+    """The reload must not clear what later output redacts as !secret."""
+    (tmp_path / "secrets.yaml").write_bytes(b"ssid: hidden\n")
+    path = _setup(tmp_path, YAML.replace("ssid: kitchen", "ssid: !secret ssid"))
+    assert yaml_util.is_secret("hidden") == "ssid"
+    apply_line_edits([_name_edit("garage")])
+    assert yaml_util.is_secret("hidden") == "ssid"
+    assert "!secret ssid" in path.read_text()
+
+
 def test_apply_writes_reloads_drops_the_cache_and_restores(tmp_path: Path) -> None:
     path = _setup(tmp_path, YAML)
     cache = compiled_config_path(CORE.config_filename)