The Events Calendar - Duplicating events leads to 404 errors

Overview of the issue

When duplicating an event to other languages, it displays a 404 error on the front-end instead of the correct event.

Workaround

The author is already aware of this situation. In the meantime, you can follow this workaround:

1. Edit the translated/duplicated event.
2. Navigate to the Time → Date option.
3. Select All Day Event and click Update.
4. Revert the changes

This will trigger the plugin required actions and create your event correctly.