My apologies.
Additionally, Command Line Tools for Xcode 13, released on September 20, 2021, exhibits the same behavior as the Safari update. It throws a "No dist file for product 001-49060" into ManagedSoftwareUpdate.log and then does not display the update in the MSC GUI.
Snippit below:
Sep 24 2021 09:38:53 -0500 ### End managed software check ###
Sep 24 2021 09:38:53 -0500 Allowing idle sleep
Sep 24 2021 09:38:53 -0500 Checking Apple Software Update catalog...
Sep 24 2021 09:38:53 -0500 Checking for available Apple Software Updates...
Sep 24 2021 09:38:54 -0500 Finding available software
Sep 24 2021 09:39:04 -0500 Attempting to quit apps: (
Sep 24 2021 09:39:04 -0500 "com.apple.Safari.SafariQuickLookPreview",
Sep 24 2021 09:39:04 -0500 "com.apple.Safari"
Sep 24 2021 09:39:04 -0500 )
Sep 24 2021 09:39:04 -0500 Waiting for user to quit any relevant apps
Sep 24 2021 09:39:04 -0500 Downloaded Safari
Sep 24 2021 09:39:05 -0500 Downloading Command Line Tools for Xcode
Sep 24 2021 09:39:35 -0500 Downloaded Command Line Tools for Xcode
Sep 24 2021 09:39:35 -0500 Done.
Sep 24 2021 09:39:47 -0500 WARNING: No dist file for product 001-49060
Sep 24 2021 09:39:48 -0500 WARNING: No dist file for product 002-02865
Sep 24 2021 09:39:48 -0500 Finishing...
Sep 24 2021 09:39:48 -0500 Saving application inventory...
Sep 24 2021 09:39:54 -0500 Performing postflight tasks...
Sep 24 2021 09:39:54 -0500 ### Ending managedsoftwareupdate run ###
For comparison, here's a log snippit of a Big Sur client that needs both the 11.6 update and the Safari update from ASU:
Sep 24 2021 08:49:15 -0500 Checking Apple Software Update catalog...
Sep 24 2021 08:49:21 -0500 WARNING: No dist file for product 002-02865
Sep 24 2021 08:49:21 -0500 Apple Update product directory MSU_UPDATE_20G165_patch_11.6 is missing
Sep 24 2021 08:49:21 -0500 Downloaded updates do not match our list of available updates.
Sep 24 2021 08:49:21 -0500 Checking for available Apple Software Updates...
Sep 24 2021 08:49:22 -0500 Finding available software
Sep 24 2021 08:49:27 -0500 Downloading macOS Big Sur 11.6
Sep 24 2021 08:49:27 -0500 Downloaded: macOS Big Sur 11.6
Sep 24 2021 08:49:27 -0500 Attempting to quit apps: (
Sep 24 2021 08:49:27 -0500 "com.apple.Safari.SafariQuickLookPreview",
Sep 24 2021 08:49:27 -0500 "com.apple.Safari"
Sep 24 2021 08:49:27 -0500 )
Sep 24 2021 08:49:27 -0500 Waiting for user to quit any relevant apps
Sep 24 2021 08:49:27 -0500 Downloaded Safari
Sep 24 2021 08:49:27 -0500 Done.
Sep 24 2021 08:49:28 -0500 Skipping metadata caching for product ID MSU_UPDATE_20G165_patch_11.6
Sep 24 2021 08:49:28 -0500 **Checking for Apple Update Metadata**
Sep 24 2021 08:49:28 -0500
Sep 24 2021 08:49:28 -0500 The following Apple Software Updates are available to install:
Sep 24 2021 08:49:28 -0500 + macOS Big Sur 11.6-11.6
Sep 24 2021 08:49:28 -0500 *Restart required
Sep 24 2021 08:49:28 -0500 *Must be manually installed
Sep 24 2021 08:49:28 -0500 Checking if /System/Library/CoreServices/FileSyncAgent.app is running...
Sep 24 2021 08:49:28 -0500 No GUI users, installing at login window.
Sep 24 2021 08:49:28 -0500 Finishing...
Sep 24 2021 08:49:28 -0500 Saving application inventory...
Sep 24 2021 08:49:31 -0500 Performing postflight tasks...
Sep 24 2021 08:49:31 -0500 ### Ending managedsoftwareupdate run ###
Despite the "installing at login window", an hour later:
Sep 24 2021 09:57:29 -0500 Checking Apple Software Update catalog...
Sep 24 2021 09:57:36 -0500 WARNING: No dist file for product 002-02865
Sep 24 2021 09:57:36 -0500 Apple Update product directory MSU_UPDATE_20G165_patch_11.6 is missing
Sep 24 2021 09:57:36 -0500 Downloaded updates do not match our list of available updates.
Sep 24 2021 09:57:36 -0500 Checking for available Apple Software Updates...
Sep 24 2021 09:57:37 -0500 Finding available software
Sep 24 2021 09:57:43 -0500 Downloading macOS Big Sur 11.6
Sep 24 2021 09:57:43 -0500 Downloaded: macOS Big Sur 11.6
Sep 24 2021 09:57:43 -0500 Attempting to quit apps: (
Sep 24 2021 09:57:43 -0500 "com.apple.Safari.SafariQuickLookPreview",
Sep 24 2021 09:57:43 -0500 "com.apple.Safari"
Sep 24 2021 09:57:43 -0500 )
Sep 24 2021 09:57:43 -0500 Waiting for user to quit any relevant apps
Sep 24 2021 09:57:43 -0500 Downloaded Safari
Sep 24 2021 09:57:43 -0500 Done.
Sep 24 2021 09:57:43 -0500 Skipping metadata caching for product ID MSU_UPDATE_20G165_patch_11.6
Sep 24 2021 09:57:44 -0500 **Checking for Apple Update Metadata**
Sep 24 2021 09:57:44 -0500
Sep 24 2021 09:57:44 -0500 The following Apple Software Updates are available to install:
Sep 24 2021 09:57:44 -0500 + macOS Big Sur 11.6-11.6
Sep 24 2021 09:57:44 -0500 *Restart required
Sep 24 2021 09:57:44 -0500 *Must be manually installed
Sep 24 2021 09:57:44 -0500 Checking if /System/Library/CoreServices/FileSyncAgent.app is running...
Sep 24 2021 09:57:44 -0500 No GUI users, installing at login window.
Sep 24 2021 09:57:44 -0500 Finishing...
Sep 24 2021 09:57:44 -0500 Saving application inventory...
Sep 24 2021 09:57:46 -0500 Performing postflight tasks...
Sep 24 2021 09:57:47 -0500 ### Ending managedsoftwareupdate run ###