I've set up a keychain as follows:
sudo /usr/bin/security create-keychain -p 'temporaryPassword' MyKeychain.keychain
The keychain is present and working as shown by:
/usr/bin/security show-keychain-info MyKeychain.keychain
Keychain "MyKeychain.keychain" lock-on-sleep timeout=300s
The permissions in ~/Library/Keychains are all consistent.
Why does Keychain Access.app not show MyKeychain in its Keychains panel?