Files renamed on every entity update when active_updating: false

Problem
When a media entity with a filefield_paths-enabled file field is saved, files are being renamed according to the configured path/name tokens even when active_updating is set to false. This happens every time the entity is saved, regardless of the setting.

Root Cause
In FileFieldPathsProcessFileLegacy.php:73, the condition that determines whether to skip file reprocessing uses property_exists() to detect if the entity has an $original property (representing the pre-save state):

property_exists($entity, 'original') && $entity->original !== NULL
On Drupal 10.x, the $original property is a magic property (accessed via __get()) rather than a real property. property_exists() returns false for magic properties, causing the entire skip condition to fail.

When the skip condition fails, the code proceeds to reprocess and rename the file, ignoring the active_updating: false setting entirely.

Solution
Instead of using property_exists() to detect the original entity, use instanceof ContentEntityInterface on the actual original entity object. This works for both magic properties and real properties:

$original_entity = DeprecationHelper::backwardsCompatibleCall(
\Drupal::VERSION, '11.2.0',
fn(): ?ContentEntityInterface => $entity->getOriginal(),
fn() => $entity->original ?? NULL
);
if ($original_entity instanceof ContentEntityInterface && ...) {
// skip processing
}
This correctly detects whether the entity has a previous version, allowing the skip condition to work as intended when active_updating is false.