fill layer with multipolygons will merge like this follow

[timeroute]

I generate geojson data using d3.contounr, the data contains features of MultiPolygon. When I render it with fill layer, the small zoom it will merge, when I scale zoom, it will normal. Here is the example.
example

mapbox-gl-js version: 1.6.0

browser: chrome

Steps to Trigger Behavior

1. Add GeoJSON data with array of MultiPolygon
2. small zoom it will merged, but it is wrong.
   
3. large zoom it shows normal
   

[timeroute]

@mourner hey are you busy? Could you please help me.

[mourner]

This is most likely a duplicate of #7023 — let's track it there.