TYPO3 Core

Can confirm this problem on TYPO3 10.4.22. Might this be related to #96077?

I can confirm this as well for version 11.5.7. Tested on clean and fresh ddev installation. When the Backend User has no access to the live workspace, the published view will be the preview from selected workspace and not from the live version as expected.

I have done some quick debuggin in the fresh 11 version. And i found out where the problem is.

Inside TYPO3\CMS\Workspaces\Middleware\WorkspacePreview.php we try to (Line 122)setTemporaryWorkspace to 0 alias Live/Production when ADMCMD_prev=LIVE is set as get parameter.

But inside TYPO3\CMS\Core\Authentication\BackendUserAuthentication.php and the called Method setTemporaryWorkspace fails the check $this->checkWorkspace($workspaceId); because there this check about the access to live workspace fails:

switch ((string)$wsRec['uid']) {
                    case '0':
                        $retVal = (($this->groupData['workspace_perms'] ?? 0) & 1)
                            ? array_merge($wsRec, ['_ACCESS' => 'online'])
                            : false;
                        break;

so we need some kind of special check/perrmission when ADMCMD_prev=LIVE is set or when this is intended to be like it is(maybe there are some sicurity aspects), the preview view makes no sense and we should see only the workspace view.

Maybe i will find the time to make my own contribution, anyway i hope with this info the issue can be resolved faster.