Comments on the final material input node are erased when opening material again

Comments on the final material input node will be erased when closing and reopening the material.

1. Create new material
2. Right click on the final material input node to bring up the node comment box. Enter something.
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3. Note that comment is displayed above node
4. Save material and close
5. Reopen the material and note that comment is now not displayed. If you right click to modify your previous comment, the field is now empty.