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If you have the Enable Synchronization property on, you are prompted to synchronize files that are affected by an updated interface. This is good. However, the manual Tools | Synchronize action does not work in this manner (see issue 49091). Since Enable Synchronization is now off by default, it appears to some users that the synchronize functionality has been reduced. Marking as a DEFECT since this is a UI regression IMO.
Issue 49091 has been fixed - (manual) Synchronize action is disabled for interfaces. I think, this issue is rather enhancement than defect now. The action could not be invoked manually for interfaces in the previous releases. The only change is that Synchronization is not enabled by default.
This feature was removed.