Steps to reproduce the issue

In the administrator panel:

1. Create two menuitems i.e. 'test1' and 'test2' of any types.
2. Open bouth menuitems 'test1' and 'test2' for editing simultaneously.
3. Change type of menuitem 'test1'.
4. Switch to tab of menuitem 'test2' and edit some parameters except 'Menu Item Type'.
5. Refresh the browser window (F5).

Expected result

Values of parameters return to values stored in the database.

Actual result

Values of parameters became as values of menuitem "test1".

System information (as much as possible)

Joomla 3.6.2

Additional comments

This bug is not critical.
It may be used to copy parameters values from one menuitem to another.