Redundant ST Interfaces

We have two tunnels configured for a single route. By default traffic is routed over the first interface defined in the configuration. When this interface goes down traffic does NOT route to the second interface:

routing-instances { transit { routing-options { static {
        route 10.31.4.0/22 {
                    qualified-next-hop 169.254.44.233 {
                        interface st0.0;
                    }
                    qualified-next-hop 169.254.45.117 {
                        interface st0.1;
                    }
                }

I've tried setting next-hop and qualitified-next-hop with preference:

routing-instances { transit { routing-options { static {
        route 10.31.4.0/22 {
                    next-hop 169.254.44.233
                    qualified-next-hop 169.254.45.117 {
                        interface st0.1;
                        preference 25;
                    }
                }

But when I disable st0.0 the connection to 10.31.4.0/22 ceases to work.

Is it possible to configure the static routes to automatically failover in case the current next-hop is down?