Custom style layer disappears along with vector layers

[interseptor]

When vector layers are present on the map along with a custom style layer, visibility of vector layers affects the visibility of the custom layer.

Mapbox Versions Affected

0.51.0
0.52.0 beta 2

Link to Demonstration

https://jsfiddle.net/interseptor/Ln69zdaw/

Expected Behaviour

The pink triangle is shown independent of the point layer.

Actual Behaviour

The pink triangle disappears in the following cases:

• when zooming in to the center of the triangle or bottom right corner of the triangle
• when the points layer is hidden using 'Switch points visibility' button in the top left corner

Additional Information

If no vector layers are added to the map (comment out points layer in the map on load function), the custom style layer works as expected.
It is not shown in the jsfiddle, but the same behavior is observed with vector tiles layer, not only geojson layers.

[ansis]

@interseptor thanks for the test case! I've opened a pull request with the fix here: #7711

Hopefully we'll be able to get it into the final 0.52 release tomorrow.