Distribution List Empty

In Contacts app on Catalina, when I select Edit_Edit Distribution List… for a contact group, it is blank/empty. Typically, this window would show all the contacts in the group and allow me to select the preferred email address to use for each recipient. Now there’s nothing in iCloud or On My Mac.

When I type the group name in the To: field in Mail app, it fills in the contacts from a previous email, which includes contacts that have since been removed from the group.

Screen Shot 2020-01-13 at 12.06.46 PM