dash-bio circos draw links of range 1

Question

I want to draw a circos plot with dash-bio of this data format:

Source Chromosome 1
Source Position 123456789
Target Chromosome  4
Target Position  987654321
value 7.8

Using the data sample from the tutorial, the links are correctly displayed:

import urllib.request as urlreq
from dash import Dash, html
import dash_bio as dashbio
import json
import pandas as pd

app = Dash(__name__)

data = urlreq.urlopen(
  "https://git.io/circos_graph_data.json"
).read().decode("utf-8")

circos_graph_data = json.loads(data)

x = [{'source': {'id': 'chr19', 'start': 22186054, 'end': 36186054}, 'target': {'id': 'chr17', 'start': 21478117, 'end': 85478117}, 'value': 43}]
layout_config = {
    "innerRadius": 100,
    "outerRadius": 200,
    "cornerRadius": 4,
    "labels": {
        "size": 10,
        "color": "#4d4d4d",
    },
    "ticks": {
        "color": "#4d4d4d",
        "labelColor": "#4d4d4d",
        "spacing": 10000000,
        "labelSuffix": "Mb",
        "labelDenominator": 1000000,
        "labelSize": 10,
    },
}

#a = dashbio.Circos(layout=data, config=layout_config)
chords_config = {"color": "RdYlBu", "opacity": 0.8}

a = dashbio.Circos(
    layout=circos_graph_data["GRCh37"],
    config=layout_config,
    tracks=[
        {"type": "CHORDS", "data": x, "config": chords_config}
    ],
)

app.layout = html.Div([
    a
])

if __name__ == '__main__':
    app.run_server(debug=True)

But changing the start and end values of range 1, the link disappear:

x = [{'source': {'id': 'chr19', 'start': 22186054, 'end': 22186055}, 'target': {'id': 'chr17', 'start': 21478117, 'end': 21478118}, 'value': 43}]

I would expect to see a very thin line. How to show a link between edges without a range (yes/no)?