on iOS onStyleLoaded is sometimes not called

[felix-ht]

Somehow the onSytleLoaded issues on ios does not seem to be fully fixed.

related to #771

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[kaspesi]

Does not seem to be fixed. Seeing this in 1 of 10 builds