I built an Apollo-like craft with probably way too much delta-v to get to the Mun. Managed to get into a 20 km by 20 km Munar orbit and found no way to transfer crew, except via EVA. One kerbal EVA ejection later and I'm like, "OK, let's try undocking first."
Attempting to undock results in a mission failure (or fission mailer?) but the craft is still in Munar orbit. I can reacquire the craft from the tracking station, but now the undock button is missing.
I'm uploading a video example now, and should be viewable in a few minutes. So echoing others, where do we submit bug reports?