No digest item for a custom consensus engine

Hello! I work on a Substrate-based chain with a custom consensus engine and as suggested in https://github.com/paritytech/try-runtime-cli/blob/b45be7dfce89fd881be27171d3ea114ef19d832c/core/src/common/empty_block/inherents/providers.rs#L96-L98 reporting a case when SmartInherentProvider doesn't work for me.

Currently, providers.rs only accounts for BABE and AURA when constructing the digest for the empty block. In my case for QF Network's blockchain node QuantumFusion-network/qf-solochain we are developing a custom consensus engine called SPIN with its own engine ID SPIN_ENGINE_ID. Because of this there is no slot with the expected engine ID in the empty block and the slot number validation fails during try-runtime usage.

It is easy to add custom engine ID in a fork project like:

// core/src/common/empty_block/inherents/providers.rs#L128
let digest = vec![
    DigestItem::PreRuntime(
        BABE_ENGINE_ID,
        PreDigest::SecondaryPlain(SecondaryPlainPreDigest {
            slot,
            authority_index: 0,
        })
        .encode(),
    ),
    DigestItem::PreRuntime(AURA_ENGINE_ID, slot.encode()),
    DigestItem::PreRuntime(*b"spin", slot.encode()),
];

But perhaps there are some recommendations on how to properly support custom engine IDs in the digest? Thank you.

core/src/common/empty_block/inherents/providers.rs から始め、特に SmartInherentProvider と 129-140 行付近の digest 構築を確認してください。BABE と AURA がどのように処理されているか、および参照されている検証パスを確認してください。カスタムコンセンサスエンジン ID（SPIN など）が期待される digest item を提供できる、サポートされた方法を確立してテストできれば完了です。