Dragging annotations is broken since MapKit JS 5.17. 😟 Mobile touch events are only supported from 5.18 on. 😠 I do need both and I am wondering if there is some kind of workaround.
I cannot even submit an official support for this request as MapKit JS seems to be still in beta... 😮
Considering the fact that MapKit JS is at version 5.29, I am also wondering why no one noticed this yet... 😕
This is working for me... I tested in Safari and Chrome with the latest version of MKJS.
You can definitely submit feedback on MapKit JS, using Feedback Assistant https://feedbackassistant.apple.com. We see all of these reports and aim to take quick action on them. In this case, since I can't reproduce what you are seeing it would be great to have a test case as well as more information about which browser and OS version you are using. I'll keep an eye out for this!