Crash when landing in water

I've had this three times in the hour or so since the update and not before.

It first happened when jumping from a build to have a look at it - I floated down with elytra and landed in the ocean -game froze for a few seconds then crashed.

The second time was maybe half an hour later after the first - this time it was ender pearl that landed in the ocean - same again, froze then crashed.

The third time was also ender pearl, same result.

 

It does NOT happen every time I land in the ocean.