I found the same problem. I suspect that rendering value / value data as a column is not expected / supported. I had a look in the AM Charts documentation but couldn't find an example of what you're looking for. (The XY-Chart is based on a third-party component.)
You may be able to do what you want with ApexChart. See KyvisLabs ApexChart Module - #70 by jd1.
Tips:
- You're missing the leading
[
on your chart JSON. (Presumably that's a pasting error.) - You should post the InitialFail dataset as well. It's required for anyone trying to reproduce your chart.