Fix overriding a script's entity_id (#78765)

tests/components/script/test_init.py

@@ -1023,3 +1023,44 @@ async def test_setup_with_duplicate_scripts(
     )
     assert "Duplicate script detected with name: 'duplicate'" in caplog.text
     assert len(hass.states.async_entity_ids("script")) == 1
+
+
+async def test_script_service_changed_entity_id(hass: HomeAssistant) -> None:
+    """Test the script service works for scripts with overridden entity_id."""
+    entity_reg = er.async_get(hass)
+    entry = entity_reg.async_get_or_create("script", "script", "test")
+    entry = entity_reg.async_update_entity(
+        entry.entity_id, new_entity_id="script.custom_entity_id"
+    )
+    assert entry.entity_id == "script.custom_entity_id"
+
+    calls = []
+
+    @callback
+    def record_call(service):
+        """Add recorded event to set."""
+        calls.append(service)
+
+    hass.services.async_register("test", "script", record_call)
+
+    assert await async_setup_component(
+        hass,
+        "script",
+        {
+            "script": {
+                "test": {
+                    "sequence": {
+                        "service": "test.script",
+                        "data_template": {"entity_id": "{{ this.entity_id }}"},
+                    }
+                }
+            }
+        },
+    )
+
+    await hass.services.async_call(DOMAIN, "test", {"greeting": "world"})
+
+    await hass.async_block_till_done()
+
+    assert len(calls) == 1
+    assert calls[0].data["entity_id"] == "script.custom_entity_id"