Content clicks don't register on mobile devices

Hi!

Great working library, works really well. However, I noticed one thing on mobile browsers:
- if there are buttons inside the dragged content, and you've not specified a drag handle (i.e. making the element itself the handle), those buttons don't work at all - tapping them does nothing

Seen on Samsung Tab S6 Lite and Apple iPad Mini 5 (2019):
- Android 11 Samsung Internet Browser
- Android 11 Chrome
- Android 11 Firefox
- iPadOS 14.6 Safari
- iPadOS 14-6 Firefox

In summary, looks like touch events are handled a little differently from mouse events.

The obvious workaround is to use a drag handle whenever there is clickable content inside - I was just wondering if there is something else that can be done.

Reproduce the issue with buttons inside draggable content and no drag handle on the listed Android and iPad browsers, then compare the touch behavior with mouse behavior. Done means the nested buttons respond to taps while dragging still works, without requiring a drag handle.

Written by the indexing model from the issue text.