Inconsistent Zooms Level

There is inconsistent zoom level on different routes and I am unable to fix it to a particular level. I'm using the following options:

```
const directions = new MapboxDirections({
accessToken: environment.mapbox.accessToken,
unit: "metric",
profile: "mapbox/driving",
flyTo: true,
interactive: false,
controls: {
inputs: false,
instructions: false,
profileSwitcher: false,
},
styles: directionStyles,
zoom: 6,
});
```

Any help will be appreciated.

Start at the MapboxDirections configuration entry point and reproduce the reported behavior with flyTo enabled and zoom set to 6. Compare the resulting zoom level across different routes, then verify whether the behavior is consistent with the documented options and identify a testable expected zoom outcome.

Written by the indexing model from the issue text.