Hovertext not always visible

Please provide us your environment, so we can easily reproduce the issue.
dash 1.20.00
dash-core-components 1.16.0
dash-html-components 1.1.3
dash-renderer 1.9.1
dash-table 4.11.3
plotly 4.14.3
displaying with chrome 90.0.4430.212
Windows 10; monitor resolution set to 1920x1080

Hovertext is not always able to be made visible when scrolling over the plotted data. This bug is difficult to reproduce, and definitely varies depending on the operating system's screen resolution. In the example below, it is impossible for me to hover over the data point with a y value of 9.0. Yet if I set the screen resolution to 1680x1050 or 800x600 the same input works fine. When it does not work, if I click in the graph and activate "show closest data on hover" then I can hover over the data - but I want to be using the "compare data on hover" in my real plots with many more traces/lines on them. Actually, in my real app, I am explicitly requesting hovermode 'x'.

I expect the hover data to always be available, regardless of monitor resolution.

reproducible code example (though the indentation is messed up when I paste it in)

import dash
import dash_core_components as dcc
import dash_html_components as html

app = dash.Dash(__name__)

app.layout = html.Div([
dcc.Graph(id='graph',
figure={'data': [{'x': ['1986-07-29','1994-04-05','1994-04-08','1994-04-18','2021-05-10'], 'y': [1.0, 2.0, 9.0, 3.0, 10.0],
'type': 'scattergl'}],
'layout': {'width': 1847.6, 'margin': dict(l=50.6, r=11.92),
'xaxis': dict(range=['1986-06-20 21:18:43.20','2021-06-17 02:41:16.80'] ) } }
) ])

if __name__ == '__main__':
app.run_server(debug=True, port=8052)

Screen recording showing the problem is also attached.
https://user-images.githubusercontent.com/25270381/117925765-f0476400-b2b4-11eb-8dc2-cc4ccb5afc04.mp4

Start with the reported dcc.Graph example and app.run_server entry point, then compare hover behavior across the listed screen resolutions, Chrome, and hover modes. Use the attached recording and verify that the y=9.0 point and other plotted data consistently expose hover information regardless of resolution.