Webform Civicrm Custom Fields across Multiple Contacts not working in Drupal 7 and Drupal 8
Re -&gt; Tab with Table style are these Multi value custom fields? We recently fixed a bug re: such custom fields in WFC D8/D9 and backported it to D7. What versions are you using? Are you able to clone from git or pull in a patch?
PS Multi value custom fields do complicate things (like eg reporting) so it may be a better option to create a regular Custom data set with the fields you need in it.
For sure non-Multi value custom fields across multiple contacts are working well - we're collecting custom fields data for up to 5 Contacts in e.g. a Family Registration form (up to 2 Adults + up to 3 Kids) - we did this in D7 -&gt; and now on D8 (this project just upgraded).