Function snapshot_masks_hk_bmp_bid_ask 

pub fn snapshot_masks_hk_bmp_bid_ask(
    info: &CachedSecurityInfo,
    qr: &QotRightData,
) -> bool

C++ APIServer_Qot_StockSnapshot.cpp:18-43 (IsHKBMP_OneStock).

When this returns true, GetSecuritySnapshot must omit bid/ask price and volume fields instead of returning delayed BMP values.