Fix #65: Never destroy the PMR allocator to early

include/fastgltf/types.hpp

@@ -2176,9 +2176,6 @@ namespace fastgltf {
 
  Asset& operator=(const Asset& other) = delete;
  Asset& operator=(Asset&& other) noexcept {
-#if !FASTGLTF_DISABLE_CUSTOM_MEMORY_POOL
- memoryResource = std::move(other.memoryResource);
-#endif
  assetInfo = std::move(other.assetInfo);
  extensionsUsed = std::move(other.extensionsUsed);
  extensionsRequired = std::move(other.extensionsRequired);
@@ -2199,6 +2196,10 @@ namespace fastgltf {
  textures = std::move(other.textures);
  materialVariants = std::move(other.materialVariants);
  availableCategories = other.availableCategories;
+#if !FASTGLTF_DISABLE_CUSTOM_MEMORY_POOL
+ // This needs to be last to not destroy the old memoryResource for the current data.
+ memoryResource = std::move(other.memoryResource);
+#endif
  return *this;
  }
  };