fix: ignore lft and rgt when migrating a tree doctype

frappe/modules/import_file.py

@@ -107,6 +107,10 @@ def import_doc(docdict, force=False, data_import=False, pre_process=None,
 
 	doc = frappe.get_doc(docdict)
 
+	if doc.meta.is_tree:
+		doc.lft = None
+		doc.rgt = None
+
 	doc.run_method("before_import")
 
 	doc.flags.ignore_version = ignore_version