Hmm the behavior that I'm seeing with a single enter is slightly different:
Edit first cell -> Click enter to get to the second row cell (see that the first edit is still there) -> Start typing and see that it replace the entire contents of the second row cell with the newly typed info.
What browser are you using? Do you mind if I log in to your app to try to reproduce this?
Also, @Herge, is it working as expected for you in the Viewer version of the app? We still need to fix this regression, but I think it should still be working as expected for end users