Fix removing suggested_display_precision from entity registry (#110671)

* Fix removing suggested_display_precision from entity registry

* Fix tests

* Update homeassistant/components/sensor/__init__.py

---------

Co-authored-by: Erik <erik@montnemery.com>

homeassistant/components/sensor/__init__.py

@@ -786,11 +786,6 @@ class SensorEntity(Entity, cached_properties=CACHED_PROPERTIES_WITH_ATTR_):
             ratio_log = floor(ratio_log) if ratio_log > 0 else ceil(ratio_log)
             display_precision = max(0, display_precision + ratio_log)
 
-        if display_precision is None and (
-            DOMAIN not in self.registry_entry.options
-            or "suggested_display_precision" not in self.registry_entry.options
-        ):
-            return
         sensor_options: Mapping[str, Any] = self.registry_entry.options.get(DOMAIN, {})
         if (
             "suggested_display_precision" in sensor_options

tests/components/sensor/test_init.py

@@ -1618,6 +1618,41 @@ async def test_suggested_precision_option_update(
     }
 
 
+async def test_suggested_precision_option_removal(
+    hass: HomeAssistant,
+) -> None:
+    """Test suggested precision stored in the registry is removed."""
+
+    entity_registry = er.async_get(hass)
+
+    # Pre-register entities
+    entry = entity_registry.async_get_or_create("sensor", "test", "very_unique")
+    entity_registry.async_update_entity_options(
+        entry.entity_id,
+        "sensor",
+        {
+            "suggested_display_precision": 1,
+        },
+    )
+
+    entity0 = MockSensor(
+        name="Test",
+        device_class=SensorDeviceClass.DURATION,
+        native_unit_of_measurement=UnitOfTime.HOURS,
+        native_value="1.5",
+        suggested_display_precision=None,
+        unique_id="very_unique",
+    )
+    setup_test_component_platform(hass, sensor.DOMAIN, [entity0])
+
+    assert await async_setup_component(hass, "sensor", {"sensor": {"platform": "test"}})
+    await hass.async_block_till_done()
+
+    # Assert the suggested precision is no longer stored in the registry
+    entry = entity_registry.async_get(entity0.entity_id)
+    assert entry.options.get("sensor", {}).get("suggested_display_precision") is None
+
+
 @pytest.mark.parametrize(
     (
         "unit_system",