I know it was working fine on ver. 1.10.1, after the upgrade to 1.10.4, I had not tested
It works only for : open tickets
/scp/tickets.php?a=export&h=&status=open

It does not work for another status, it only able to export first ticket info only:
/scp/tickets.php?a=export&h=&status=assigned
/scp/tickets.php?a=export&h=&status=closed
This is what's shows in excel:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html><body><p>"Ticket Number"
Date Created Subject From From Email Priority Department Help Topic Source Current Status Last Updated Due Date Overdue Answered Agent Assigned Team Assigned Thread Count Attachment Count
646408
</p></body></html>
Server Information
osTicket Version v1.10.4 (035fd0a) — Up to date
Web Server Software Apache
MySQL Version 5.7.24
PHP Version 7.0.32