V2 Wordcloud tooltip is displaying coordinates instead of weight

[pjeannet]

While testing migration from v1 to v2 I noticed that the wordcloud charts we used broke.
One of the bug I could identify is that the value for each word displayed in the tooltip seems random and is not the weight.
If you go to the sample page (or image below) you can see that :

• colors and borders are strange (one of the other bugs)
• tooltip is showing what looks like coordinates instead of the weight value
  
  The react samples are also buggy but not as much! (using an older version I think) :
• colors are fine
• tooltip is only showing abscissa
  
  I think what we expect to see was something like this (source is the v1 samples)