Route enhancing on multi domain system using slug field

[lrsvgl]

On a multi domain page I have articles to deliver across the domains.
In list view the plugin is configured to show a certain category for delivery of articles across domains, functions as expected.
By trying to get the detailView the system shows a 404 page not found message.

The configuration of the route enhancing is:

TtNewsDetail:
type: Plugin
namespace: tx_ttnews
routePath: '/artikel/{tt_news}'
aspects:
tt_news:
type: PersistedAliasMapper
tableName: tt_news
routeFieldName: slug
defaults:
tt_news: '0'

If I change the routeFieldName for example to „uid“, „crdate“ or even „title“ the article is shown in detailView.
Changing back to the field „slug“ the 404 page is shown.

Knowing that I figured out and deleted all duplicates in the slug field. No change of behaviour.
Finally in my developing system I deleted all articles except one und the behaviour is still the same.

Actually I’m running out of ideas.
Maybe there is a wrong configuration concerning cHashes?
Or the RouteEnhancing is not optimal?

Thank You in advance.

[romanchev]

I have the same problem. I have sysfolder for tt_news outside the website tree.
The problem is related to TCA settings for slug field for tt_news.
If you change
'eval' => 'uniqueInSite',
to
'eval' => 'unique',
the problem will be solved.

There are some conditions related to the situation in typo3/sysext/core/Classes/Routing/Aspect/PersistedAliasMapper.php
and it seems this conditions produce the problem

        if ($this->slugUniqueInSite) {
            $results = array_values($this->filterContainedInSite($results));
        }