Hopefully fixed for the next release.
For some reason, the "RAMIS_SLEEPWITH_DOMORNING" flag was raised and was never cleared. It should have raised during sleep and cleared during that same sleep session, but I assume something must have interrupted that sleep and the flag remained raised post-sleep. So with it raised, even after swapping sleeping partners, the ending part of the related scene plays in order to clear the flag.
The fix should now clear that flag upon swapping or dropping sleeping partners more consistently.