Completed lessons do not display as "completed" automatically

[mnurzyns]

After completing several lessons in a row and going to the lesson plan, only the last lesson was marked as completed.

Manually marking the lesson as completed works correctly.

A few possibly significant conditions:

• automatic playback of lessons turned off when finished
• part of the lesson was played in acceleration
• after entering the lesson again, it shows a com about the possibility of starting at the ending point 00:00:00