It is a tricky situation to understand, I checked with the team for possible solution as far as i see this can only be achieved with legacy views.
The idea is to create a view for the patent posts that checks the number of posts created by the user which is achieved using a separate view and with the help of wpv-conditionals, we can display the parent posts that has the child created by the user.
1) Create a View for the top level parent posts that queries the post type with Parent Post Query filter and No parent (return top-level elements)
2) Create a Separate View for the child posts, This outputs only the post count, (view name child-view)
[2.a] Here we need to Add Two Query filters
-------> In the Query filter Choose Post author and select the option "Post author is the same as the logged in user". This will query for all the post created by the user
--------> Add Another Query Filter Choose Post Parent and select the Option "parent is the current post in the loop."
[2.b] In the loop editor use the below code , Make sure it is added in single line without any spaces.
[wpv-layout-start][wpv-items-found]<!-- wpv-loop-start --><wpv-loop>[wpv-items-count]</wpv-loop><!-- wpv-loop-end -->[/wpv-items-found][wpv-no-items-found][wpv-items-count][/wpv-no-items-found][wpv-layout-end]
- The code returns only the post count based filter we selected in 2.a
- In the view above the output editor Select the option "Disable the wrapping DIV around the View
3) Now open the View created in Step 1 Here in the loop editor , Wrap the loop tempalate inside a conditional tag to check for number of items in the child view created in step 2.
<wpv-loop>
[wpv-conditional if="( '[wpv-view name='child-view']' gte '1' )"]
<li>[wpv-post-body view_template="loop-item-in-parent-page"]</li>
[/wpv-conditional]
</wpv-loop>
This will only out the parent posts if they have chid posts created by the user.
I hope this helps better,
Let me know if you need more assistance :
References:
https://toolset.com/documentation/user-guides/views/filtering-views-query-by-author/#post-author-is-the-same-as-the-logged-in-user
https://toolset.com/documentation/legacy-features/views-plugin/conditional-html-output-in-views/#conditions