oldest_block_identifier's index is returned as 0 and hash is empty

[Arslan2]

In network/status response, oldest_block_identifier's index is returned as 0 and hash is empty.
Here is the response of network/status.

{
    "current_block_identifier": {
        "index": 1166658,
        "hash": "NY3cxPTi9g4IaL2Y456zHe5nM8Hw8kDsZp-iuh9TtLk"
    },
    "current_block_timestamp": 1641366488000,
    "genesis_block_identifier": {
        "index": 1,
        "hash": "La6PuV80Ps9qTP0339Pwm64q3_deMTkv6JOo1251EJI"
    },
    "oldest_block_identifier": {
        "index": 0,
        "hash": ""
    },
    "sync_status": {
        "current_index": 1166658,
        "target_index": 1180999,
        "synced": false
    },
    "peers": [
        {
            "peer_id": "/p2p/1124yb49BKQ67d4HohNaJe1MeVfSAgd9qsa3oZ6j5vw6mx2y4bXD"
        },
        {
            "peer_id": "/p2p/1128MYeBdsHt5Y9wFTWNc2mdqEw9FwzaqeRQKxTWpuz9Yax1raMC"
        },
        {
            "peer_id": "/p2p/1128k7YK3UfSh5qaAp37qe2jw3LaG6ycQUAAqD33L9v9DoRHdrkK"
        },
        {
            "peer_id": "/p2p/112hNspUUPrnW7UZapfMtrVSuSbAfErGsS6akEhQYYDMh3RT2zie"
        },
        {
            "peer_id": "/p2p/11LiGvAJf2Fd9tWMU3KPPAxHm9fwDejd9w9T9745RUS16AY1RQH"
        },
        {
            "peer_id": "/p2p/11RxgDXwQTQkVoeF5CwvD93dbFG4Ddgmoda4kXycrJszg3nJjC9"
        },
        {
            "peer_id": "/p2p/11hSTRyG8UzZfJKgTa9B6J6BCqMCaidnweRWW4gsFiK5czizHX2"
        },
        {
            "peer_id": "/p2p/147ywXZTzadiS6dMe4bLbuyJZpQF5EvQum7VsQZWZeVLXYwMuFL"
        }
    ]
}

[syuan100]

@Arslan2 please test the latest optimizations branch. If that branch works then we will close this issue when the branch is merged.