fix: type-safe check for block type

cms/djangoapps/contentstore/helpers.py

@@ -17,6 +17,7 @@
 from xmodule.contentstore.content import StaticContent
 from xmodule.contentstore.django import contentstore
 from xmodule.exceptions import NotFoundError
+from xmodule.library_content_block import LibraryContentBlock
 from xmodule.modulestore.django import modulestore
 from xmodule.xml_block import XmlMixin
 
@@ -336,7 +337,7 @@ def _import_xml_node_to_parent(
     new_xblock = store.update_item(temp_xblock, user_id, allow_not_found=True)
     parent_xblock.children.append(new_xblock.location)
     store.update_item(parent_xblock, user_id)
-    if new_xblock.scope_ids.block_type == "library_content":
+    if isinstance(new_xblock, LibraryContentBlock):
         # Special case handling for library content. If we need this for other blocks in the future, it can be made into
         # an API, and we'd call new_block.studio_post_paste() instead of this code.
         # In this case, we want to pull the children from the library and let library_tools assign their IDs.