I filed this question to stackoverflow and it shows, that this is a bug feature in the Goggle Maps API.
See: https://stackoverflow.com/questions/67895102/calling-google-maps-infowindow-open-causes-website-to-scroll-down-to-the-infowin
To resolve the issue, I could set the widgets settings in the Markers section: ‘When should Info Windows be displayed?’ from ‘Always’ to ‘Click’ or ‘Mouse over’.
Maybe you could add a setting to change the behavior, so that the InfoWindowOpenOptions are changed to have shouldFocus = false?
