Event advanced search does not work because of encoded &s

The event advanced search is not working because it is double-encoding the search parameters. If you go to the event list, click "Search" and enter "HELLO" in the "Event Text" field and submit, the URL changes to:

https://demo.opennms.org/opennms/event/list?limit=10&amp%3bsortby=id&amp%3bfilter=msgsub%253DHELLO

This is wrong... the ampersands are being encoded as "&amp%3b" which destroys the query string.

This is reproducable on demo.opennms.org.