IGPAPI
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    Variable TimelineFeedThreadsInFeedUnitSchemaConst

    TimelineFeedThreadsInFeedUnitSchema: Struct<
        {
            id: Union<readonly [String, Number]>;
            media_dicts: $Array<
                Struct<
                    {
                        id: optionalKey<String>;
                        media_type: optionalKey<Number>;
                        user: optionalKey<
                            Struct<{ pk: Union<readonly [String, Number]>; username: String }>,
                        >;
                    },
                >,
            >;
            title: String;
        },
    > = ...

    The Threads block the feed inserts — its own id, its title and the Threads posts it shows. Recorded on the Android 451 timeline; the recorded posts carry no feed logging token, and no recording shows a request issued from the block.