[DNSB]

Interesting. I am on the same build level for Windows 11 though I am running calibre 8.0.1 from source. I have not tried removing annotation files since I use a different workflow for those.

Spoiler:

calibre 8.0.1*  embedded-python: True
Windows-10-10.0.26100-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.26100')
Python 3.11.5
Windows: ('10', '10.0.26100', 'SP0', 'Multiprocessor Free')
Interface language: None
EXE path: C:\Program Files\Calibre2\calibre-debug.exe
Successfully initialized third party plugins: ACSM Input (0, 1, 0) && LCPL Input (0, 0, 5) && Gather KFX-ZIP (from KFX Input) (2, 22, 0) && DeDRM (10, 0, 9) && AZW6 Image Merge (1, 1, 1) && Package KFX (from KFX Input) (2, 22, 0) && ACSM Input Plugin GUI Extension (0, 1, 0) && Apple Books covers (0, 2, 0) && Backup Configuration Folder (1, 1, 2) && Barnes & Noble (1, 5, 6) && Count Pages (1, 13, 6) && Diaps Editing Toolbag (0, 5, 0) && EpubCheck (0, 2, 5) && EpubMerge (3, 2, 0) && EpubSplit (3, 10, 0) && FanFicFare (4, 43, 0) && Find Duplicates (1, 10, 9) && Generate Cover (2, 3, 5) && Goodreads (1, 8, 2) && Job Spy (1, 0, 239) && KFX metadata reader (from KFX Input) (2, 22, 0) && From KFX (2, 22, 0) && KFX Input (2, 22, 0) && Set KFX metadata (from KFX Output) (2, 14, 0) && KFX Output (2, 14, 0) && Kindle hi-res covers (0, 5, 1) && KindleUnpack - The Plugin (0, 83, 7) && Kobo Metadata (1, 10, 0) && Kobo Utilities (2, 20, 0) && Modify ePub (1, 8, 5) && Obok DeDRM (10, 0, 9) && Open With (1, 8, 4) && OverDrive Libby (0, 2, 101) && Quality Check (1, 13, 16) && Resize Cover (1, 2, 1) && ScrambleEbook (0, 6, 0) && SmartEject (2, 6, 0) && Smashwords Metadata (1, 0, 2)
QPA platform: windows
devicePixelRatio: 1.0
logicalDpi: 96.0 x 96.0
physicalDpi: 81.55183946488295 x 81.64285714285714
ApplicationPaletteChange event ignored
Using calibre Qt style: True
ApplicationPaletteChange event received
[0.00] Starting up...
[0.00] Showing splash screen...
[1.16] splash screen shown
[1.16] Initializing db...
[1.53] db initialized
[1.53] Constructing main UI...
[2.38] [DEBUG] [koboutilities.config:<module>:61] CreateNewCustomColumn is supported
DEBUG:    0.0 obok::utilities.py - loading translations
DEBUG:    0.0 obok::dialogs.py - loading translations
DEBUG:    0.0 obok::config.py - loading translations
DEBUG:    0.0 obok::action_err.py - loading translations
qt.webengine.QWebEngineView OK
ACSM Input: GUI Plugin Genesis!
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
[overdrive_libby/0.2.101*f2fb6d4] Loaded 0 items from file cache C:\Users\dbowe\AppData\Roaming\calibre\plugins\overdrive_libby.libraries.json
[overdrive_libby/0.2.101*f2fb6d4] Loaded 0 items from file cache C:\Users\dbowe\AppData\Roaming\calibre\plugins\overdrive_libby.media.json
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
[3.42] GUI main window shown
EpubMerge: DEBUG: 2025-03-22 12:15:10,179: calibre_plugins.epubmerge.epubmerge_plugin(156): macmenuhack file_path:C:\Users\dbowe\AppData\Roaming\calibre\plugins\fanficfare_macmenuhack.txt
FFF: DEBUG: 2025-03-22 12:15:10,193: calibre_plugins.fanficfare_plugin.fff_plugin(216): Plugin FanFicFare macmenuhack file_path:C:\Users\dbowe\AppData\Roaming\calibre\plugins\fanficfare_macmenuhack.txt
Job Spy has begun initialization...
Calibre, and hence Job Spy, was gracefully shut down last time?  True
Last time daemon started:  never
Last time daemon failed:  never
Total daemon starts inception_to_date:  0
Total daemon failures inception-to-date:  0
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
JS: ===>>> change_gui_alternating_row_colors()
Job Spy has finished initialization...
[3.55] [DEBUG] [koboutilities.action:KoboUtilitiesAction.rebuild_menus:368] device.supports_ratings=False
[3.55] [DEBUG] [koboutilities.action:KoboUtilitiesAction.set_toolbar_button_tooltip:278] start: text='None'
[3.55] [DEBUG] [koboutilities.action:KoboUtilitiesAction.device_driver_name:921] could not load extended driver. Exception= No module named 'calibre_plugins.kobotouch_extended'
[3.55] [DEBUG] [koboutilities.action:KoboUtilitiesAction.set_toolbar_button_tooltip:297] setting to text='Utilities to use with Kobo ereaders

Driver: KoboTouch'
[3.55] [DEBUG] [koboutilities.action:KoboUtilitiesAction.rebuild_menus:374] have device.
[3.58] main UI initialized...
[3.58] Hiding splash screen
[3.58] splash screen hidden
[3.58] Started up in 3.58 seconds with 16233 books

edit: I tried removing all annotation files since they are already backed up and did not get any errors. See attached image. OTOH, after removing annotations, I got UUID added to the In Library column.

edit 2: actually a couple of books showed with AUTHOR instead of UUID in the In Library column.