MapBox GL possible bug: Not all labels rendered when using a symbol-placement of line

[carmenau]

Using geojson as a source for mapbox gl. We are rendering road vectors and would like to render the labels for these roads above on a separate layer.
For Rendering labels I'm using the following styling:

    layers = layers.push(Immutable.fromJS({
        'id': 'markers1',
        'source': sourceId,
        "layout": {
            "text-field": "{title}",
            'text-allow-overlap' : true,
            'visibility' : 'visible',
            'symbol-placement': 'line',
            'text-max-size': 10
          },
        'paint': {
            "text-color": "red",
            'text-size': {"stops": [[14, 6], [15, 8], [17, 10]]}
        },
        'type' : 'symbol'
    }));

The issue is that the only a 5-7 out of 40+ of the labels are rendering, however when the symbol-placement: 'line' field is removed, then all the labels render. I wonder if this is some collision issue. I've played with the label text length as well as the font size to minimal change.

Any insight to what is happening here would be helpful.