Customer Email No Longer Visible when Hovering Over Reporter

My too but it's not consistent.

That on a side, with this all UI changes last and this year hard to follow.

The inconsistency Arkadiusz describes has a cause that sits outside JSM, and it's separable from the question of whether something changed.

It's an account setting. Email address visibility belongs to the individual Atlassian account, not to JSM or the project, and the holder controls it at id.atlassian.com/manage-profile/profile-and-visibility, where email sits alongside profile photo, location and local time as a field they pick an audience for. So two reporters on the same project can render differently with nothing configured differently on your side. That's the expected shape.

There's a second split that matters more for what you're actually doing, because it depends on where you are looking rather than on who the customer is. In the admin screens the setting doesn't apply to you: "Your email address is always visible, no matter its visibility setting, to organization admins, user access admins and site administrators when they're managing users in the Administration screens." Inside the product it does: "Visibility settings for all other fields, including the email address field, are applied when organization admins, user access admins and site administrators collaborate with you within Atlassian apps." A work item is the second case and the user list is the first, so an address the hover card won't give you is still readable from the user list in admin.atlassian.com. Clumsier than a hover, but it survives whatever the card does.

None of that explains an address disappearing for reporters who haven't touched their own profile, which is the part you actually noticed. Only that one is a regression. The evidence that separates it cleanly is a customer whose visibility is set to Anyone and whose address still doesn't appear.