add known issue 13235415

Author: aczechowski

memdocs/configmgr/core/get-started/2022/includes/2202/9708999.md

@@ -43,3 +43,9 @@ Try to complete the tasks. Then send [Feedback](../../../../understand/product-f
 1. If all of the dependent collections can be deleted, select **Delete all listed collections**.
 
 1. Review the list of collections and any software deployments that the site will also remove. You also can **Delete each collection member from the database**.
+
+### Known issue when deleting collection references
+
+<!--13235415-->
+
+Consider the scenario where you're deleting collections with references, and another administrative user is simultaneously creating a reference to a collection that you're deleting. When this behavior occurs, the console displays an error, and the collection isn't deleted.