Ensure missing-attribute prevention flag is always restored (#57970)

Co-authored-by: Xurshudyan <[email protected]>

Author: xurshudyan

src/Illuminate/Database/Eloquent/Model.php

@@ -2447,11 +2447,11 @@ public function offsetExists($offset): bool
 
         static::$modelsShouldPreventAccessingMissingAttributes = false;
 
-        $result = ! is_null($this->getAttribute($offset));
-
-        static::$modelsShouldPreventAccessingMissingAttributes = $shouldPrevent;
-
-        return $result;
+        try {
+            return ! is_null($this->getAttribute($offset));
+        } finally {
+            static::$modelsShouldPreventAccessingMissingAttributes = $shouldPrevent;
+        }
     }
 
     /**