Hi,
We are experienced issues on labels custom fileds, in new issues view, on JIRA Software projects and JIRA Service Desk.
When we try to set a label, that already exist on this field, the JIRA ask for create a new label.
The sugestions list present by typing some charecters are not from this field but from the default label field (tags).

If we go to older view the custom labels field work properly.

We already try to change schema and screen fields configuration and nothing change this behavior.