Create a not well written XML file to import entries in a glossary.
Go to your glossary (it doesn't matter which kind of glossary it is) and from the "Browse by alphabet" page click the link (in the second row) "Import entries".
Select your wrong file and start the import.
At the end of the moodle import attempt you will get "Total entries: 0", "Imported entries: 0"
and the "Import entries" link is no longer active.
To start over the process I MUST go back selecting "Browse by alphabet"
The button "Continue", that is correctly shown when you try to import entries from a non selected file, is missing.