Safari tile error when switching from 2d to 3d

[zoran995]

When changing from 2d to 3d viewer in safari we get

Tile Error: Got a 200 (OK) response from URL
...
but it could not be loaded as an image.

To reproduce

• open https://map.terria.io/#share=s-dlDBYJS3O00Dk72ntDRtKSbkcxW
• open the map in 2d
• ensure the layer is visible
• change to 3D view

For future reference, after a quick look into the code, it seems like an error was thrown from the delayed update of the leaflet map while we have already moved to a 3D view. It looks like a race condition

Originally posted by @zoran995 in #7384