I think I may have found some games to work myself, but I just just repro'd in Oswan 0.8.1 on Rockman & Forte.
Completing the intro stage (landscape) and then selecting AirconMan (game turns portrait) still results in everything showing up in sideways-landscape.
Can try again in 0.8.2. 0.8.1 (at least on/by Sierra) also seems to have developed a freeze-state bug; quick-freezing by hotkey reports that the file was created but could not set proper type info; quick-defrosting pops the defrost overlay but restores no state.