I have created custom module using Module Builder Studio with 1-1 relation to core Contacts module. I placed this relation into detailed view and I can see it in Studio as relation for both modules. The problem is that when I use this relation, correct name is displayed on the other side but ID in URL is undefined (/#/contacts/record/undefined). This looks like the relation is working but rendering is wrong. I use default unmodified template. All changes in modules are done using UI. When I use default relationships (“assigned to”), this works as it should. I tried “Rebuild Relationships” and “Quick Repair and Rebuild” but to no use. I see no errors in prod.log.
Thanks for the help in advance.