I want it to be in the correct coordinates system but when I go to export (since quite a few versions ago), it shows the coordinate system as 'Local Coordinates' and it is greyed out so we cannot change it to WGS84. It does not appear to default to that as when I export it, it is not where it should be. It has moved and when I pan, rotate or zoom in Cesium, the model vanishes.
My workflow involves importing a 3d model into a blank chunk and then converting that to 3D tiles and manually geolocating it in WGS84 with the basemap active.
As I say, this workflow used to work. Now I have to install an old version when I need to do this process.