Nesting of operators for event search form

Steps to replicate:
Find Participants with status = Registered
Select a few
Participant status - change
Change them to 'Attended'
On next page load, you'll see results, refresh the page - no results and bunch of notices.

Warning: array_key_exists(): The first argument should be either a string or an integer in CRM_Utils_Array::value() (line 55 of CRM/Utils/Array.php).
Notice: Array to string conversion in CRM_Contact_BAO_Query::buildQillForFieldValue() (line 5858 of CRM/Contact/BAO/Query.php).
Warning: array_key_exists(): The first argument should be either a string or an integer in CRM_Utils_Array::value() (line 55 of CRM/Utils/Array.php).
Notice: Array to string conversion in CRM_Contact_BAO_Query::buildQillForFieldValue() (line 5858 of CRM/Contact/BAO/Query.php).

It seems on every refresh the status params are getting nested with the operator passing wrong params to the query