Web Planner: URL parameters missing

When plotting a route if you insert an empty mid or end point in the itinerary the URL reverts to the value: "https://web.locusmap.app/en/plan" . The map center latitude and longitude and zoom level are absent and remain absent until you either zoom in/out, drag the map or change its size.

I think this behaviour started happening in a recent release - not sure which but maybe 1.56.0 or 1.56.1. Before that I believe it worked OK and always displayed map center lat/lng and zoom.