How to correct the wrong icon for a website bookmark

The PNG files are named using a MD5 hash of the website URL. For example, the name for the Google image is stored by hashing www.google.com to get 0A137B375CC3881A70E186CE2172C8D1.png

#!/bin/zsh
# Fix Safari Favorites Icons

CS="cache_settings"; TIC="Touch Icons Cache"; DIR="$HOME/Library/Safari/$TIC/Images"
DB="$DIR/../${${TIC// }%%s*}${${(C)CS}//_}.db"; SQL=$(sqlite3 "$DB" "SELECT host FROM $CS")
sqlite3 "$DB" "UPDATE $CS SET ${${${(L)TIC// /_}#*_}//s/_is_in}=1, download_status_flags=1"
for png in "$1"/*.png; do URL="$(plutil -convert xml1 -o - "$DIR/../../Bookmarks.plist" | \
awk -F '[</>]' -v name="${${png##*/}%%.*}" '$3~name{getline;getline;getline;print $5}')"; \
cp -f -v "$png" "$DIR/${(U)$(md5 -q -s $URL)}.png"; done; chflags -v uappnd $DIR $DB

From here: https://gist.github.com/dardo82/f7cc7c5c864fb5afa04bb12ecbcf3a9f

The script takes a folder with the missing touch icons as its only argument.

Each favicon needs to have the same name as the bookmark associated with it.

The newly updated gist works with Safari 13 but now if you clear the browser cache the added favicons disappear in the new tab and reappear upon restart!