I worked hours on finding out what I am doing wrong, and then I checked the behavior first time in safari and there it is working fine. So maybe this is a bug and I don't know how to fix this. Maybe I did something wrong. You can check a complete testcase on my site:
Once you open the link you'll see a map which is draggable. Then after a scroll of its parent Ext.Panel the map is nomore draggable (the cursor is nomore a hand). As well on other map components (click the below button to open a Ext.Sheet with a map included) the behavior changes.
Can you please check if you have the same problem on your side?