Overlay series title is not rendered when no series use right price scale

[SuperPenguin]

Lightweight Charts Version: 3.7.0

Steps/code to reproduce:

import { createChart, LineData, UTCTimestamp } from "lightweight-charts";

const chartRoot = document.getElementById("main-chart") as HTMLDivElement;
const chart = createChart(chartRoot, {
  width: 800,
  height: 600,
});

const line1 = chart.addLineSeries({
  priceScaleId: "overlay",
  color: "rgb(255, 0, 0)",
  title: "SIN",
});
const line2 = chart.addLineSeries({
  priceScaleId: "overlay",
  color: "rgb(0, 255, 0)",
  title: "COS",
});

const data1: LineData[] = [];
const data2: LineData[] = [];

const now = new Date();
function dateToUTC(date: Date): UTCTimestamp {
  return Math.floor(date.getTime() / 1000) as UTCTimestamp;
}

for (let i = 0; i < 90; i++) {
  data1.push({
    time: dateToUTC(now),
    value: Math.sin(i * 4 * Math.PI / 180),
  });

  data2.push({
    time: dateToUTC(now),
    value: Math.cos(i * 4 * Math.PI / 180),
  });

  now.setDate(now.getDate() + 1);
}

line1.setData(data1);
line2.setData(data2);

Actual behavior:

Series title is not rendered

Expected behavior:

Series title should rendered

When another series is added that use right priceScale, even though it's not used, will fixed issue above. However if it used only left priceScale, it won't render title properly again

const line3 = chart.addLineSeries();

Screenshots:

with line3 added

CodeSandbox/JSFiddle/etc link:

[timocov]

@SuperPenguin what's the reason to use empty visible price scale (right or left but without sources)? just to display values from overlay sources? it seems that it will be pretty much clear without anything on it