Visual glitches with stacked fill-extrusion layers

Nobody has claimed this yet.

I'm stacking several `Polygon` layers in a GeoJSON to render the floors of a building in Mapbox GL JS using the `fill-extrusion` layer type. This mostly works fine, but I frequently see some visual glitches in the form of white dots in the seam between floors of the building. These flicker in and out as you rotate/zoom the map. They appear for some but not all sides of some but not all buildings.


Curious if this is a known issue and whether there's a workaround. Here's all the data you need for a repro. I'm on Mapbox GL JS 0.52 and Mac OS X 10.13.6 with Chrome 71.0.3578.98, but I've seen this across a couple of devices.

* [mapbox studio repro](https://api.mapbox.com/styles/v1/danvk/cjqskihj30dcy2sqha7xaripx.html?fresh=true&title=true&access_token=pk.eyJ1IjoiZGFudmsiLCJhIjoiY2lrZzJvNDR0MDBhNXR4a2xqNnlsbWx3ciJ9.myJhweYd_hrXClbKk8XLgQ#18.12/22.226877/-111.104884/9/60)
* [Gist of GeoJSON data](https://gist.github.com/danvk/a5947c4d4488500bf2dc3fcc8acc2407)

Style:

```json
{
"fillExtrusionPaint": {
"fill-extrusion-base": {
"property": "min_height",
"type": "identity"
},
"fill-extrusion-color": "#ffffff",
"fill-extrusion-height": {
"property": "height",
"type": "identity"
}
}
}

```

**mapbox-gl-js version**: 0.52

**browser**: Chrome 71.0.3578.98 / Mac OS X 10.13.6

### Steps to Trigger Behavior

1. Click this [mapbox studio link](https://api.mapbox.com/styles/v1/danvk/cjqskihj30dcy2sqha7xaripx.html?fresh=true&title=true&access_token=pk.eyJ1IjoiZGFudmsiLCJhIjoiY2lrZzJvNDR0MDBhNXR4a2xqNnlsbWx3ciJ9.myJhweYd_hrXClbKk8XLgQ#18.12/22.226877/-111.104884/9/60)
2. Right click to rotate around
3. Observe the glitchy white lines

### Link to Demonstration

[mapbox studio link](https://api.mapbox.com/styles/v1/danvk/cjqskihj30dcy2sqha7xaripx.html?fresh=true&title=true&access_token=pk.eyJ1IjoiZGFudmsiLCJhIjoiY2lrZzJvNDR0MDBhNXR4a2xqNnlsbWx3ciJ9.myJhweYd_hrXClbKk8XLgQ#18.12/22.226877/-111.104884/9/60)

### Expected Behavior

### Actual Behavior

cc @pandananta

Start with the linked Mapbox Studio reproduction and the linked GeoJSON data, using the reported fill-extrusion style and rotating or zooming the map to observe the flickering white seams. No source file or test is named in the issue, so trace the fill-extrusion rendering path from this reproduction. Done means reproducing the artifact and establishing a fix or documented workaround for stacked floors.

Written by the indexing model from the issue text.