Cannot Undo Comment Creation in Material Editor. Not in Undo History

Cannot undo the creation of a comment in the material editor. When creating the comment, it automatically has you rename the comment. When hitting Ctrl Z, you undo the renaming action, but never the comment creation itself.

Note: Comment creation does not appear in undo history

Tested in 4.13 - This issue is present - NOT a regression.

1. Open any project
2. Create a new material
3. Open the material in the Material Editor
4. Create a comment in open space with hitting the C key
5. Hit Ctrl Z

Result: The comment is not removed from the event graph.

Expected: The comment is removed from the event graph.