Ship died landing in water, but all control parts were still functional?

[CiberX15]

I had a ship land heavily in water, mostly medium sized parts, landing at 10m/s. The second the ship touched the water the ship crashed dialog popped telling me that I had failed and everyone was dead. Except… no parts had broken. Not even the engine the ship landed on.  The ship was still intact, clearly floating on the surface of the water. Both the command pod and the crew cabin were intact. So I don’t know what triggered the dialog to pop, but there was no way to clear it once it did so I had to reload my save even though my kerbals had actually touched down safely.

I'm wondering now if something did break but it didn't render correctly or something.