Upgrade from 21.0.0 beta1 to stable release

I have version 21.0.0 beta1 installed as an Unraid container. I have selected the stable channel but it will not show the stable version of Nextcloud. What have I done wrong?

Thanks.

Luis.

I think I found the solution. I switched back to beta channel and the stable release was offered as an upgrade - does not make sense but it worked.