This is somewhat related to bug 63133, but might remain separate depending on how that one is resolved...

If there is a scrollable element of an article, such as a wide table, the TOC swiping makes it impossible to scroll back to the left-hand side of the element.

For example, go to this article in the alpha Android app:
https://en.wikipedia.org/wiki/List_of_doctor_who_serials

The main content consists of large tables of information, which appear in boxes that you must scroll back and forth within to view more than the first few columns. However, it quickly becomes impossible to scroll more than a few pixels at a time, and scrolling backwards is impossible because that swipe action instead pulls the entire article away to reveal the TOC.

Version: Android (alpha)
Severity: major