Custom style URL not showing custom styles consistently after offline download

[kevinmanncito]

Hey @mfazekas, this V10 version is working great for us! Thanks for all the hard work. However, there is the one issue we have run into.. Here it is:

• Download an offline map with custom styles
• After downloading the custom styles disappear at various zoom intervals (seems to mostly affect linestrings)
• Before download there is no issue with the custom style at any zoom level

I have been able to reproduce this with a super simple custom style: mapbox://styles/onwaterllc/clhcm7yjv00dl01rh4d0thgaz

Here is my fork of the rnmapbox/maps examples app that also reproduces the issue: main...kevinmanncito:maps:offline-map-demo

Here is a demo video of me zooming around before downloading and the custom styles seem to work fine:

before-download.mov

Here is a demo video of me zooming around after downloading and the issue appears:

after-download.mov

I'm happy to fill out the issue template as well if that would be best, just let me know! Thanks

[kevinmanncito]

Using the example app for the native ios sdk I was able to reproduce this issue upstream. I'll post over there and see what I can find.

native.mov

[kevinmanncito]

And... here is the upstream issue that was already there: mapbox/mapbox-maps-ios#1940

[mfazekas]

@kevinmanncito awesome, thanks much for all the work on this!

[kevinmanncito]

I found a decent workaround for our use case (thanks to mapbox support). Turn off source compositing in the custom style:

Make sure to do that first thing when you create the map then add the custom sources to the map.

It sounds like there is a slight performance degradation when source compositing is off but it hasn't been noticeable for us. Here is the link to the docs on source compositing: https://docs.mapbox.com/studio-manual/reference/styles/#source-compositing