Unchanged properties are logged on model update

[Jacobtims]

Describe the bug
When I update my model (that uses the LogsActivity trait) the Activity record contains properties that weren't updated. The properties "old" array contains null values and the "attributes" array contains attributes that weren't updated.

To Reproduce
I have the following options in my model:

public function getActivitylogOptions(): LogOptions
{
    return LogOptions::defaults()
        ->logUnguarded()
        ->logOnlyDirty()
        ->dontSubmitEmptyLogs()
        ->dontLogIfAttributesChangedOnly(['updated_at']);
}

Example of an update:

// Retrieve a random model
$myModel = \App\Models\MyModel::first();

$myModel->fill([
    'timezone' => 'UTC',
]);

$myModel->save();

// Retrieve the latest log
$log = \Spatie\Activitylog\Models\Activity::where('description', 'updated')->latest()->first()?->toArray();

dd($log, $myModel);

Activity log:

Expected behavior
I expect that the Activity record only contains properties that where updated.
In my case only the "timezone" property.

Versions

• PHP: 8.2.26
• Database: mysql
• Laravel: 11.35.0
• Package: 4.9.1