Chrome Version       : 56.0.2924.87 (64-bit)

What steps will reproduce the problem?
Using ChromeVox on a ChromeBook read the content of

<div tabindex="0" role="gridcell" aria-label="This should be announced">
  Some text
</div>


What is the expected result?
The aria-label should be announced

What happens instead?
ChromeVox does not announce the aria-label


Please provide any additional information below. Attach a screenshot if possible.
If the role is removed ChromeVox does announce the aria-label. Note that this happens only on ChromeOS. When using the ChromeVox extension it works well.

Demo: https://jsfiddle.net/tamalet/oubvt2jp/