By switching styles, it clears any existing layer

[vcardins]

[korywka]

It is not bug, it is how mapbox API works :)
One way to bypass this is to draw layers on style.load event: https://github.com/korywka/mapbox-gl-controls/blob/5ca4d76310ed324abc4b76cb465106b118be82e4/example/example.js#L99

Please, let me know if you still need help.

[vcardins]

Closing. I ended up using el/style-switcher#27, which has the preserve layers solution implemented.

[korywka]

Nice, but keep it mind that preserving layers can cause other bugs. For example, if you change paint properties of street style layers, these layers can be missing in satellite style. This is the reason why it is better to implement redraw by yourself. But if it works for you - it is cool.