Zwave-js-ui in docker created a new zwave-js-ui-old container?

Before I updated HA to 2024.7.x I updated my zwave-js-ui container to the (at the time) latest version to meet the required zwavejs version.

everything went as expected and it’s all running fine.

then I went into portainer and found a stopped “zwave-js-ui-old” container in the container list. I have no idea where that came from.

The container is stopped so obviously my system isn’t using it so I assume it’s safe to delete it. I think…?

Does anyone have any idea why that was created?