Hi,
Environment : Windows 10 LTSC 1809
1) Loaded modified WIM file in to tablet.
2) Create default user (Test)
3) Sideload custom apps using default user.
4) Create multiple users.
5) Sideloaded apps are available automatically in all user accounts.
6) Login to default user (Test).
7) Perform Sysprep with generalize, OOBE & Shutdown option.
8) Sideloaded apps are not available in default user account from where sysprep operation was performed, Available in other user accounts.