The 'done' x is being ignored

[wattcommunity]

So I have a test file with the following lines:

x Chris #Goodrop x 2017-01-09 Modify form for tomorrow and send x Sue's +laptop +purchasing x Intel or AMD intel for +laptop x Modify form for tomorrow's +lcc @mtg and send x Send form +lcc

The way I understand the todo.txt format is that these should be marked as completed. However they are not :

It seems however, if a date follows the x then the complete status is correctly picked up.

However this should not be a requirement so I thought ? Is this a bug or have I missed something.

Using Firefox (latest)