I was playing as Japan against the Soviets/Allies when the Persian Intergerity Restoration Evert occured. All unannexed territory reverted to prewar-state (thus I lost the entire occupied Asia and Siberia), and the war between Axis/Allies-Soviets ended with the event. Thus, it acts like the bitter peace event..
(excuse me in Advance if this bug is already known, thanks.)
(excuse me in Advance if this bug is already known, thanks.)