Blueprints with accent characters fail to open when converted from 4.19 to 4.20

Any Blueprint with accents in the name, coming from 4.19 won't open in 4.20.

Double clicking the asset, trying to right click asset, results in no actions.
When loading the project this message appears in log:

LogUObjectGlobals: Warning: Failed to find object 'Object /Game/Jira64698àèìòù.Jira64698àèìòù'

1. Create a 4.19 project
2. Create a Blueprint with an accent character in the name (à è ì ò ù)
3. Open the Blueprint. This works.
4. Upgrade the project to 4.20
5. Open the project and then try to open the Blueprint.

Results: The Blueprint can no longer be opened.

Fix UE-51650

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