Update AbstractRepository.php (#1224)

src/Discord/Repository/AbstractRepository.php

@@ -210,11 +210,16 @@ public function save(Part $part, ?string $reason = null): ExtendedPromiseInterfa
             $headers['X-Audit-Log-Reason'] = $reason;
         }
 
-        return $this->http->{$method}($endpoint, $attributes, $headers)->then(function ($response) use ($part) {
-            $part->created = true;
-            $part->fill((array) $response);
-
-            return $this->cache->set($part->{$this->discrim}, $part)->then(fn ($success) => $part);
+        return $this->http->{$method}($endpoint, $attributes, $headers)->then(function ($response) use ($method, $part) {
+            switch ($method) {
+                case 'patch': // Update old part
+                    $part->created = true;
+                    $part->fill((array) $response);
+                    return $this->cache->set($part->{$this->discrim}, $part)->then(fn ($success) => $part);
+                default: // Create new part
+                    $newPart = $this->factory->create($this->class, (array) $response, true);
+                    return $this->cache->set($newPart->{$this->discrim}, $this->factory->create($this->class, (array) $response, true))->then(fn ($success) => $newPart);
+            }
         });
     }