I had one crash while renaming the container and I’ve sent the report. This time, there was no crash, but the renamed container shows the old name. Maybe it’s just cosmetics, but since a crash preceded it I’m reporting it anyway.
BONUS
When container is empty there is no Show Panels option in the dropdown menu. I needed to drag the Panel from different container. Once there is a Panel, there is also a menu item Show Panels. Rather confusing while configuring a new container.