Confusion using "ssh-add -D" and then "ssh-add -l"

[Chris Green]

I'm confused by the following:-

    rcfg at q957$  ssh-add -l
    256 SHA256:gl9l9m/xnYpL9P7WkL60L+FcJ0+r2c5Ci770p9VEC08 chris at q957 (ED25519)
    256 SHA256:4XDYbepg8zK43pofpQ8IGxMAXkej298a0XZHWjJTIQQ chris at q957 (ED25519)
    3072 SHA256:yeQw8xe9rrxHKLqICoXNwReZKKV9HI1UeTCf95QywXM chris at t470 (RSA)
    256 SHA256:dluRgJeTqJ32jKxRrSdjr/cibbIOZQeq8Inlna3+Sdw chris at q957 (ED25519)
    3072 SHA256:dJws+ny7+uWMo2hwFl6yNGE5vFsW1ZKiO0EXwTIfNPc chris at t470 (RSA)
    256 SHA256:BxqEiksrCXPxKvQyBXqOqw1WKda110lYiC00Z+fKP4A chris at q957 (ED25519)
    rcfg at q957$ ssh-add -D
    All identities removed.
    rcfg at q957$ ssh-add -l
    256 SHA256:4XDYbepg8zK43pofpQ8IGxMAXkej298a0XZHWjJTIQQ chris at q957 (ED25519)
    3072 SHA256:yeQw8xe9rrxHKLqICoXNwReZKKV9HI1UeTCf95QywXM chris at t470 (RSA)
    256 SHA256:dluRgJeTqJ32jKxRrSdjr/cibbIOZQeq8Inlna3+Sdw chris at q957 (ED25519)
    256 SHA256:gl9l9m/xnYpL9P7WkL60L+FcJ0+r2c5Ci770p9VEC08 chris at q957 (ED25519)
    3072 SHA256:dJws+ny7+uWMo2hwFl6yNGE5vFsW1ZKiO0EXwTIfNPc chris at t470 (RSA)
    256 SHA256:BxqEiksrCXPxKvQyBXqOqw1WKda110lYiC00Z+fKP4A chris at q957 (ED25519)
    rcfg at q957$ 

What's going on here?  I was expecting all the entries to disappear,
but they don't.

I checked when reverting to my default 'chris' login with
$HOME=/home/chris but it's exactly the same:-

    chris$ ssh-add -l
    256 SHA256:4XDYbepg8zK43pofpQ8IGxMAXkej298a0XZHWjJTIQQ chris at q957 (ED25519)
    3072 SHA256:yeQw8xe9rrxHKLqICoXNwReZKKV9HI1UeTCf95QywXM chris at t470 (RSA)
    256 SHA256:dluRgJeTqJ32jKxRrSdjr/cibbIOZQeq8Inlna3+Sdw chris at q957 (ED25519)
    256 SHA256:gl9l9m/xnYpL9P7WkL60L+FcJ0+r2c5Ci770p9VEC08 chris at q957 (ED25519)
    3072 SHA256:dJws+ny7+uWMo2hwFl6yNGE5vFsW1ZKiO0EXwTIfNPc chris at t470 (RSA)
    256 SHA256:BxqEiksrCXPxKvQyBXqOqw1WKda110lYiC00Z+fKP4A chris at q957 (ED25519)
    chris$ ssh-add -D
    All identities removed.
    chris$ ssh-add -l
    256 SHA256:4XDYbepg8zK43pofpQ8IGxMAXkej298a0XZHWjJTIQQ chris at q957 (ED25519)
    3072 SHA256:yeQw8xe9rrxHKLqICoXNwReZKKV9HI1UeTCf95QywXM chris at t470 (RSA)
    256 SHA256:dluRgJeTqJ32jKxRrSdjr/cibbIOZQeq8Inlna3+Sdw chris at q957 (ED25519)
    256 SHA256:gl9l9m/xnYpL9P7WkL60L+FcJ0+r2c5Ci770p9VEC08 chris at q957 (ED25519)
    3072 SHA256:dJws+ny7+uWMo2hwFl6yNGE5vFsW1ZKiO0EXwTIfNPc chris at t470 (RSA)
    256 SHA256:BxqEiksrCXPxKvQyBXqOqw1WKda110lYiC00Z+fKP4A chris at q957 (ED25519)
    chris$ 

I guess I'm misunderstanding something but I don't see what at the moment.


-- 
Chris Green