Invitation Redemption modifying DisplayName attribute

Hi All,

Haven't found much on this, other than someone with the same issue ~6 years ago and no further details. 

I'm generating guest user invites through Graph and configure the display name in a particular way. I've noticed that when that guest logs in for the first time, the display name changes, removing my custom configuration. I can see this in audit logs for the user account, corresponding to their login to the tenant for the first time where the account is moved from PendingAcceptance to Accepted. 

Activity Type: Update User

Category: User Management
Type: Application
Display Name: Microsoft Invitation Acceptance Portal

Is there a setting or flag to block this, ideally, they keep the same display name I set in the first place.

Thanks!