Possible scattermapbox tile refresh issue when zooming in/out (custom tile server)


I have a question about the scattermapbox functionality in Plotly, specifically with respect to the refresh of map tiles when zooming in/out while using a custom tile server url.

After zooming into a map a couple of steps, I try to zoom out the same amount of steps, but somehow the tiles do not seem to refresh and the map shown is different to the map I started with.
For example, this is easier to notice when the name of a country (or city) suddenly appears on the map after zooming 1 step in. But when you zoom 1 step out right after, the name keeps showing on the map.
I noticed, however, that the name of the country disappears after panning and having the country or city name go beyond the plotly map borders.

Is that a known behavior, a bug, or something wrong in my code?

You can use the code below to reproduce the behavior:

		<script src='https://cdn.plot.ly/plotly-latest.min.js'></script>
		<div id='myDiv'></div>

	var data = [{
	var layout = {
		dragmode: "zoom",
		mapbox: {
				style: "white-bg",
				layers: [
								sourcetype: "raster",
								source: ["https://b.tile.openstreetmap.org/{z}/{x}/{y}.png"],
								below: "traces",
				center: {lat: 40.0, lon: -80.0},
				zoom: 1.0,
	Plotly.newPlot('myDiv', data, layout)

Note: I noticed that the first example at [https://plotly.com/javascript/mapbox-layers/] is using
mapbox: { style: “open-street-map”}
and the tile refresh works fine when zooming in/out. So I took the tile server url it is calling underneath
(https://b.tile.openstreetmap.org/{z}/{x}/{y}.png) and used it on “layout.mapbox.layers” as a custom tile server url, in which case the tile refresh is showing the behavior I’m explaining above.

Thank you.