Unable to add new case Roles

[larnoult]

Following this issue about new case creation, that I eventually circumvented using the API explorer to create them, I now face an issue while adding new role to a case type.. When I try to add a role from the case type option panel (HOMEURL?page=CiviCRM&q=civicrm%2Fa%2F#/caseType/31/caseType/XX) I'm redirected to HOMEURL/#/list and adding the role is not saved.

I'm also unable to add a specific person to a case, when I navigate to the case, then people and pressing the add case role button.

Looking in the log, I see this warning that might be related?

[warning] Deprecated join alias 'relationship_type' used in APIv4 get. Should be changed to 'relationship_type_id' Caller: Civi\Api4\Query\Api4SelectQuery::getField
Array
(
    [civi.tag] => deprecated
)