Steps to reproduce the issue

Go to Joomla Update -> Update Source
Change the Update channel from Joomla Next to Default
Click Save

Expected result

The channel is changed

Actual result

The channel remains the same
You are on the "Joomla Next" update channel. Through this channel you will be notified when the future major release (7.x) will be available. Before upgrading to 7.x you'll need to assess its compatibility with your environment. You will not be notified about updates of the current Joomla release (6.x).

System information (as much as possible)

Joomla 6.0.1 with cloudaccess

Additional comments

Nothing i try changes the behavior