1) hosts page
2) click "all hosts on page" button
3) edit multiple environment
Host list is wrong. There are ~40 hosts selected and they appear to be the ones selected on the page plus some other random hosts.
Individually clicking the 20 hosts on the page returns the correct host list
This may be due to bug where clicking on edit multiple when no hosts are selected still drops down a menu. If I do not use the menu when it is "disabled" then it appears to work correctly. However this need investigating.