Behavior with the old elements windows: After a formula was inserted the first '<?>' was selected. With the new elements dock the cursor is positioned behind the inserted formula.
The new elements dock should also select the first '<?>' as this increases usability.
Marcos Paulo de Souza committed a patch related to this issue.
It has been pushed to "master":
fdo#68877: Select "<?>" as Elements window do
The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
Affected users are encouraged to test the fix and report feedback.