Sometimes highlights incorrect part of code

I wrote some code in the explorer, but hovering on the AST highlights incorrect part of code. I checked that the parser got it correctly since in the AST I can see `loc.start` and `loc.end` which are correct.
Also interestingly the incorrect highlighting occurs only when I turn on transformations (`jscodeshift`).

Reproducing the bug :
1. Url - https://astexplorer.net/#/gist/19f3253e8b18edff41bd04aa889db30b/367ef808268896551b562adb256ec7833882db4a
2. Parser: recast-0.12.3
3. Transformer: jscodeshift-0.3.30
4. My code -
```js
x = {
kd : merge(
{a : 1, b : 2},
{a : 1, x : 1}
)
};

state = 1;
```
5. Chrome Version 61.0.3163.100 (Official Build) (64-bit)
6. I am also attaching a screenshot of the bug

Start with the linked AST Explorer reproduction using recast-0.12.3 and jscodeshift-0.3.30, then trace the hover-highlighting behavior when transformations are enabled. Compare the highlighted range with the parser's loc.start and loc.end values for the supplied code. Done means hovering highlights the correct source region in this reproduction.

Written by the indexing model from the issue text.