Camera.flyTo the dateline

1. A concise explanation of the problem you're experiencing.

In 2D mode, when you try to use Camera.flyTo on a Rectangle that spans the antimeridian, the camera instead zooms out to span the entire globe. The east/west orientation of the points or the east/west attributes in the rectangle don't seem to matter.

This works fine in 3D mode. Any way around this bug in 2D mode?

4. The Cesium version you're using, your operating system and browser.

Cesium 1.5.5, Windows 10, Chrome 74

Looks like this is a known bug:

Hannah posted some thoughts on a potential fix there. Sounds like it might potentially be an easy fix.

The issue at #7909 has just been closed and may resolve your issue. Look for the change in the next stable release of Cesium or get it now in the master branch on GitHub