Aditya Divekar writes:

The case we handled was regarding the welcome message. The display name property of the address was not actually changed. So if the user has not supplied a display name for the address, the display name will remain empty in that case. Only the welcome message will temporarily use the user display name. Would that still be a problem in this case?

For the welcome message it's not going to cause a problem.

Based on the explanation it would be reasonable for you to add, "so privacy problems are out of scope of the issue I'm working on."