Yes, I am sure. Just tested RWS and TWS. In every stage of TMS UP, (incl. TWS bugged) that the contact was in, the lock was dropped when pressing the EJ button. Sucks when you want to keep tanks on as long as possible and want to jett them mid fight.
STT is the final stage of TMS UP when just your contact is shown on the radar display as all radar energy is on the contact.
Also, before the last patch, you could switch from NAV to MOM or DFM and not drop the lock as well.
Also, also, as I seen posted elsewhere, the actual HUD pipper freezes and does not track the contact when switching modes as well. I am sure ED is aware of all this. I just wasn't sure if any of this was intentional to try and make it more accurate.