MGLFillStyleLayer partially disappear when zooming in

[VasylKhmil]

Environment

• Xcode version:
• iOS version: 12.5
• Devices affected: iPhone XR
• Maps SDK Version: v6.3.0

Observed behavior and steps to reproduce

Some polygons rendered by MGLFillStyleLayer partially disappear on certain zoom levels.
When adding a polygon as an annotation - everything works, but rendering via layer - creating this issue.
Tested with different settings(max zoom level, min zoom level, adding layer on top, removing opacity), but nothing helps.

Interesting that it happens only if polygon is in area with a huge list of elements on map.

Take a look on video and code sample.

           let polygon = MGLPolygon(
                coordinates: region.polygon, 
                count: UInt(region.polygon.count)
            )
            
            let source = MGLShapeSource(
                identifier: region.identifier, 
                shape: polygon
            )
            
            let layer = MGLFillStyleLayer(
                identifier: region.identifier, 
                source: source
            )
            
            layer.fillColor = NSExpression(forConstantValue: region.color.withAlphaComponent(0.2))
            layer.fillOutlineColor = NSExpression(forConstantValue: region.color)
                
            style.addSource(source)
            
            if let buildingLayer = style.layer(withIdentifier: Constants.Map.Layer.buildingId) {
                style.insertLayer(layer, below: buildingLayer)
            }
            else {
                style.addLayer(layer)
            }

https://drive.google.com/file/d/1d5DmcVUdOy2z0pL2KEG8vI4c5DBdgj6B/view?usp=sharing

Expected behavior

I expect some way of giving map priority of a layer drawing to avoid this issue.

[macdrevx]

Transferred to the pre-v10 repo