In the F-4 Phantom II, should you be a WSO/RIO with an AI as the pilot, if the pilot initiates ejection sequence the player/WSO/RIO will become stuck, unable to exit. Have not tested in MP or with another player (//Because I don't have friends// ;-;), but reproducibility in singleplayer is 100% for AI/pilot initiated ejection.
After the pilot ejects the WSO/RIO seems to be in a weird juxtaposition, somewhere between ejection and being inside. The second seater has no possibilities to get out, any and all options fail to show results.