Manually editing rules files with the latest version of cursor when autosave is enabled causes the cursor to move to the description field upon save - currently the only workaround is to disable autosave when editing any rules files.
For example, with autosave turned on, if you started to type the quick brown fox...
in the main text body field, after typing th, autosave kicks is and e qui… will get appended to the end of the description field.