Tildes used in .ssh/config for specifying IdentifyFile paths relative to the HOME directory are not expanded by keychain as part of all_host_identities. The --confallhosts flag then will not find those keys because tilde expansion will not have occurred when the $keyf variable is expanded as part of the if [ -f "$keyf" ]; then check.
I've created a patch that corrects this that I submitted as a PR
Tildes used in
.ssh/configfor specifying IdentifyFile paths relative to the HOME directory are not expanded by keychain as part of all_host_identities. The--confallhostsflag then will not find those keys because tilde expansion will not have occurred when the$keyfvariable is expanded as part of theif [ -f "$keyf" ]; thencheck.I've created a patch that corrects this that I submitted as a PR