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ack_range only added when ack_range_count > 0: (epan/dissectors/packet-quic.c)

   /* ACK Ranges - Repeated "Ack Range Count" */
    while (ack_range_count) {

        /* Gap To Next Block */
        proto_tree_add_item_ret_varint(ft_tree, hf_quic_ack_gap, tvb, offset, -1, ENC_VARINT_QUIC, NULL, &lenvar);
        offset += lenvar;

        proto_tree_add_item_ret_varint(ft_tree, hf_quic_ack_ack_range, tvb, offset, -1, ENC_VARINT_QUIC, NULL, &lenvar);
        offset += lenvar;

        ack_range_count--;
    }

Sample captures here