shared location is incorrect

[axd1967]

I'm trying to share the approximate location of V1405 Cas (#90) but seem to be hitting another bug.

Test procedure:

1. go to stellarium-web.org/
2. zoom in on M52 (https://stellarium-web.org/skysource/M52?fov=2.6694&date=2021-05-14T21:18:39Z&lat=51.04&lng=3.71&elev=0)
3. enable eq grid in order to locate a precise ra/dec (see https://github.com/Stellarium/stellarium/issues/1667 for the RA/DEC values: 23h25m45.59s / +61d18m18s)
4. search for a star near those coordinates, eg https://stellarium-web.org/skysource/GaiaDR22015452642470814080?fov=0.079576&date=2021-05-14T21:22:21Z&lat=51.04&lng=3.71&elev=0

bug: the URL above is NOT jumping to that location

here is the location iteratively searched for:

and here is where the URL lands:

Notice how

1. the EQ grid has been rotated
2. there is no data box (top left)

Also experienced in https://github.com/Stellarium/stellarium-web-engine/issues/87#issuecomment-841211220