CloudKit Share Participant no longer returns name

I'm working on an app that uses CloudKit sharing functionality. The sharing features have been working great, but recently I no longer get the user names back from the

CKShare.Participant

when a user accepts the sharing request.

Details

I'm using the built-in

UICloudSharingController

to set up the share, which works and sets up the share properly.

When the invited user accepts the share, the owner gets a notification of the change in the zone and then fetches the

CKShare

.

The fetched

CKShare

object has an array of share participants (

CKShare.Participant

), which has a

nameComponents

property. I've used this in order to get the first and last name of the participants to display in the UI. This was all working fine until recently.

Now, however, I'm only getting values in

nameComponents

for the owner of the share. The accepted participants have

nil

values for the

nameComponents.givenName

and

nameComponents.familyName

.

I have not changed anything in this part of my code in some time, so don't think I've caused this. I've tried this on iOS 11, 11.4, 12, 12.1 and all have the issue. This leads me to believe there might have been a change on the server side from Apple.

Note I am not requesting

.userDiscoverability

permissions. I have not had to do that in order to get the names once a user accepts. I realize that I can request that and then use

CKDiscoverUserIdentitiesOperation

to get the names. But I'd rather not as I don't want the dialog, which is confusing for users.

Has anyone seen this change? Or better, yet, does anyone have any suggestions for tracking down the cause or fixing it?

Thanks.