Context menu is grayed out after clicking vehicle icon and before creating route

[easbar]

1. go to https://graphhopper.com/maps/
2. from/to text fields are empty, click one of the vehicle icons
3. right click the map -> 'Set as Start/Intermediate/End' entries are grayed out
4. (bonus) click vehicle icon again -> markers are created in Sibay, Russia, context menu entries become active again, but from/to fields still empty even though there are markers on the map