If you try to open a landing page with an eZ Flow block, and the user doesn't have access to one of the items in the block, there will be an "UnauthorizedException" and the block won't be displayed:

request.CRITICAL: Uncaught PHP Exception eZ\Publish\Core\Base\Exceptions\UnauthorizedException:
"User does not have access to 'read' 'content' with: contentId '127'" at
/var/www/001/Sites/eZ/530/vendor/ezsystems/ezpublish-kernel/eZ/Publish/Core/Repository/ContentService.php line 132
{
"exception":
"[object]
(eZ\\Publish\\Core\\Base\\Exceptions
UnauthorizedException(code: 401):
User does not have access to 'read' 'content' with: contentId '127'
at /var/www/001/Sites/eZ/530/vendor/ezsystems/ezpublish-kernel/eZ/Publish/Core/Repository/ContentService.php:132)"
}

Steps to Reproduce

1. Configure a new block in "ezpublish_legacy/settings/override/block.ini.append.php"
   block.ini.append.php

   [General]
   AllowedTypes[]=LatestContent6
   
   [LatestContent6]
   Name=Latest content 6 items
   NumberOfValidItems=6
   NumberOfArchivedItems=6
   ManualAddingOfItems=disabled
   FetchClass=eZFlowLatestContent
   FetchParameters[Source]=NodeID
   FetchParametersSelectionType[Source]=single
   FetchParametersIsRequired[Source]=true
   FetchParameters[Classes]=string
   FetchFixedParameters[Limit]=12
   ClassesList[]
   ClassesList[]=article
   ClassesList[]=landing_page
   ViewList[]=latest_content
   ViewName[latest_content]=Latest content
   

2. Create a folder: "My Folder"
3. Under "My Folder", crate three articles: "Article #001", "Article #003", "Article #003"
4. Create a new section "Section No"
5. Edit "Article #003" and set it to be part of "Section No"
6. Create a landing page, add a "Latest content 6 items" block, and set its source to "My Folder"
7. Execute the eZFlow crojob

   php ezpublish/console --env=prod ezpublish:legacy:script runcronjobs.php ezflow
   

8. Open the landing page in the frontend with anonymous
9. Confirm the exception in "cat ezpublish/logs/prod.log"

Please notice that the item should just not to be displayed.