I recently posted here and here about problems restoring Web Page Icons in Bookmarks after a Safari “Reset” (Clear Cache & Clear All History) — following the Safari 11 update install.
Prior to the Safari 11 update, Web Page Icons were easily restored in Bookmarks by replacing the Webpageicons.db file in ~/Library/Safari with a previously stored, recent copy of the Webpageicons.db file, and by also deleting the Webpageicons.db-shm and Webpageicons.db-wal files also located in the ~/Library/Safari folder. Relaunching Safari after this would always restore the Web Page Icons in Bookmarks.
Safari 11 apparently no longer generates Webpageicons.db-shm and Webpageicons.db-wal files in the ~/Library/Safari folder so the old workaround no longer works.
The following workaround should however, restore the Web Page Icons in your Bookmarks list after the aforementioned Safari “Reset” makes them “disappear”.
The Webpageicons.db file in ~/Library/Safari no longer needs to be replaced with a recent copy and again, there are no longer Webpageicons.db-shm and Webpageicons.db-wal files to delete.
Instead, following a Safari “reset”, quit Safari. Then:
1) Inside the ~/Library/Safari folder, find the Favicon Cache folder. Open the Favicon Cache folder.
2) Delete the following files:
favicons.db
favicons.db-lock
favicons.db-shm
favicons.db-wal
DO NOT DELETE THE FAVICONS FOLDER
The four deleted files will be regenerated when you re-launch Safari 11 and after relaunch, your Web Page Icons should display throughout your entire Bookmarks List in Safari 11.
MacBook Pro, OS X El Capitan (10.11.6)