It seems to be bug for map's marker.

1. When update list of markers for map component dynamically via setData(), the old markers are still shown. This includes when you remove some of markers, or add new ones. Old markers are still shown. It seems to not be able to remove, or update markers.

2. As well for its calloutMessage , please see below image.

"Hello world" is new message updated. It gets rendered on top of old message.

Above two cases happen on iOS (not happen on Android) since iOS v. 10.3.3 up until 11 beta 2.

FYI: Tested with IDE v1.01.171013 as well. Still happening.