Issue #3204113: An error occurred while submitting the form with an image attached.

src/Pmfs.php

@@ -65,11 +65,11 @@ class Pmfs {
   protected $messenger;
 
   /**
-   * Current request.
+   * Request stack.
    *
-   * @var \Symfony\Component\HttpFoundation\Request
+   * @var \Symfony\Component\HttpFoundation\RequestStack
    */
-  protected $request;
+  protected $requestStack;
 
   /**
    * Static storage of loaded form settings.
@@ -110,7 +110,7 @@ class Pmfs {
     $this->state = $state;
     $this->lock = $lock;
     $this->messenger = $messenger;
-    $this->request = $request_stack->getCurrentRequest();
+    $this->requestStack = $request_stack;
   }
 
   /**
@@ -515,7 +515,7 @@ class Pmfs {
         'pmfs',
         $type,
         $id,
-        $this->request->cookies->get(static::COOKIE),
+        $this->requestStack->getCurrentRequest()->cookies->get(static::COOKIE),
       ]);
     }
     return $this->userGeneratedKeys[$type][$id];