If a Key Editor whose Record in Editor button is enabled does not have focus when Cubase quits, its Record Enable button’s state is disabled when the project is reopened.
In other cases the state of the button is saved, e,g., if the window is frontmost when Cubase is closed.
It does not matter which track is selected, nor do the states of “Editor Content Follows Event Selection” or “Esit/Solo in MDID Editors Follow focus”
Simply put, If the Key Editor window is frontmost, the setting is saved, and if it’s not, the sequencer reopens with Record in Editor disabled for that window.
New project, new midi track, new midi part
Open midi part in windowed editor
activate Record in Editor if it is not activated
Bring Project Window to front without closing Key Edit
Launch Cubase, Reopen project
Record in Editor is disabled