Maybe a bug with "flyToBoundingSphere" - not possible to use the mouse with pitch "from Top"

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

if I “flyToBoundingSphere” with a pitch = -1.5707963267948966 (that I think should be view from top)

the camera look right, but the mouse doesn’t work anymore,

so no zoom, no pan, etc.

if I set the pitch to -1.55 it work a bit,
if I set the pitch to -1,52 it work again.

2. A minimal code example. If you’ve found a bug, this helps us reproduce and repair it.

var pitch = -1.5707963267948966;

var offset = new Cesium.HeadingPitchRange(map.initHeading, pitch, 0);, {
offset: offset,

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