Redirect problem, after trying modern URL Routing

[asolut365]

Hi there

So I wanted to try the modern URL routing, but I'm also using form2Content component. After I changed it to modern, the redirecting, after saving is not working anymore.

I changed URL routing to legacy again, but it is still not working. Here is an example.

I want to make a new article with the form:
?option=com_form2content&task=form.display&view=form&layout=edit&id=582&Itemid=317

Then I click on Save, it tries to redirect to this link:
/mitglieder/"aliasname of menuitem"/article/edit/562

But as it is not working it always redirects to index.php

I did a restore of all Joomla, it worked for a few hours, then not anymore.

Anyone any ideas, what configs could be messed up