In order to exclude previously selected items, current selection needs to be passed in #widget_content within the field widget.

See https://drupal.stackexchange.com/a/277898/45409

Comments

oknate created an issue.

Deno’s picture

Deno CreditAttribution: Deno commented

good idea.

danharper’s picture

danharper CreditAttribution: danharper as a volunteer and at hrpr commented

+1 for this

alvarito75’s picture

alvarito75 CreditAttribution: alvarito75 commented

I tried the solution on the link above and it worked, thanks.