The presence of image backed annotations should not trigger log messages

[boundsj]

Once a GL sprite backed annotation is added to the map, the message [INFO] {Worker}[Sprite]: Can't find sprite named 'default_marker' is seen for every tile parse that has a UIView backed annotation in it. The message comes from this line in sprite_store.cpp but the underlying issue is that annotations that are are actually backed by UIViews are not fully understood by core implementation.

[jfirebaugh]

The SDK is trying to add a point annotation with the icon property set to an empty string, thinking that that will result in a point annotation without an icon, as described here. But in fact mbgl core doesn't have a concept of "point annotation without an icon". For historical reasons, the empty string is mapped to the "default_marker" icon, and any other string that doesn't have a matching icon will result in this debug message.

I think you should find another way to implement what you need for annotation views. This isn't an intended use for the core annotations API.

[boundsj]

Thanks @jfirebaugh. Noting that we discussed the workaround of using a transparent image with a specific name until we nail down exactly what the true fix will be.

cc @1ec5

[boundsj]

This was recently fixed in #5461 for iOS and Android was already using the same same solution.