I completely understand the headache this UI delay is causing you, especially after you have already exhausted the standard destination cache resets and SFC scans. Since clearing the AutomaticDestinations folder did not force the shell to update, your issue is likely rooted in a corrupted shell view cache, which prevents File Explorer from processing live directory change notifications and repainting the UI automatically.
To resolve this underlying corruption, you need to flush the Shell Bags registry keys, which dictate how Windows Explorer draws and caches these folder views. Press the Windows key + R, type regedit, and navigate exactly to the HKEY_CURRENT_USER\Software\Classes\Local Settings\Software\Microsoft\Windows\Shell path. Right-click and delete both the BagMRU and Bags subkeys entirely, then immediately restart your computer or restart the explorer.exe process via Task Manager.
This specific action forces Windows to rebuild the folder view configuration from scratch upon the next boot, restoring the real-time visual refresh capability for your Quick Access pins. If this registry correction successfully restores your immediate pinning functionality, please click accept answer.
Tracy.