Vector tiles are not displayed in Chrome (v 69.0.3, latest one) running on iOS(11.4.1). The same application works on safari in iOS 11.4.1 and on iOS 12 (all browsers). Also when the JS API version is changed to 4.8, everything runs smoothly. There are no basemap load error or any exceptions in loading a view. Are you guys having similar problems ?
P.S see attached images of same application with 4.8 and 4.9 api on iOS 11.4.1 chrome 69.0.3.