Ok I resolved the issue with saving values by disabling Yith Tab Manager
The last issue I have is with bidirectional relationship is between two different post types (product and featured_item) using two different field names (related_products and related_projects)
I was able to create bidirectional fields when I used a single field related_posts which I placed in both the Product and Project edit pages, but I’ll need to use a different field name for each post type
Is it possible to create bidirectional fields using two different field names?