Microsoft has fixed built-in Windows 10 app flights for Insiders

As you may already know, several days ago Microsoft paused updates for built-in UWP apps for Windows Insiders in the Fast and Slow rings. According to the Windows Insider team, they decided to improve the quality of the inbox apps for the upcoming Windows 10 Fall Creators Update.
However, some Insiders noticed that a number of new features disappeared from the Windows apps and then returned. Windows Insider Program Chief Dona Sarkar explained that there was a targeting issue that caused Fast and Slow Ring Insiders to receive updates for the Photos, Groove Music, Movies and TV and Paint 3D apps by mistake.

Finally, the team has managed to resolve the issue. Now, all the missing features of stock apps will return. The features include:

• For Photos, Insiders will notice the loss of features like video editing and search.
• For Groove Music, Insiders may notice the loss of the Top Music Video Gallery and Mini-View features. If you are signed in and have more than 100 local playlists, playlists beyond 100 will be lost. Any playlist that has been created and not synced to the cloud will be lost.  All music will need to be re-grovelled and re-matched, a process that could take up to an hour depending on collection size.
• For the Movies & TV app, Insiders may notice a loss of some UX improvements such as spacing reduction, scrolling headers, and other usability improvements as well as better support for personal videos on SD cards, share functionality from trailer browse, and defaulting to maximized full screen for video playback. Any purchases will need to re-synced to your PC. Uncompleted downloaded rentals will need to be manually executed via File Explorer (they’ll show as expired within Movies & TV).
• For Paint 3D, Insiders will notice the loss of Line and Curve and ability to Save/Load .glB files as well as some other smaller UX changes. Insiders will be unable to open any saved projects created while they had the newer build of Paint 3D.

The issue will not affect Fast Ring Insiders who have configured the Skip Ahead feature in Windows 10 to go directly to the next development branch of the OS, currently known as "Redstone 4". If you were affected by the issue, the upcoming app update will resolve it automatically.

Source: OnMSFT