OIDC: Backchannel logout not being called when using Sign out all Session in Keycloak

Hi,

When I try to use the “Sign out all sessions” on a sessions page in Keycloak it appears the back-channel endpoint is not being called.

If I individually sign each session out in the UI, Keycloak trigger backchannel logout to my server and the user is logged out.

Is this by design? Can anyone confirm on this?

Keycloak version - 22.0.5