Blueprint Structure Tooltip Edits Get Discarded

Blueprint Structure tooltip edits get discarded. Current workaround is to make a secondary change that is not needed along with the desired change, Then edit it again to remove the secondary change.

Found in 4.18 CL# 3832480, 4.19 CL# 4033788, 4.20 CL# 4302132, 4.21 CL# 4359072

1. Open the Editor
2. Create a new blueprint structure
3. Add a new variable
4. Edit  the tooltip to say "hello world"
5. Change focus to commit the change
6. Re-edit the tooltip to say "Hello world"

Results:
The tooltip will revert the changes made to it

Expected:
Changes to the tooltip will remain