LetsEncrypt certificate is not recognized by Chrome Android 6.0.1/5.0.2

From: Kaiduan Xie <kaiduanx@xxxxxxxxx>
To: Josh Aas <josh@xxxxxxxxxxxxxxx>, "Let's Encrypt CA Development" <ca-dev@xxxxxxxxxxxxxxx>, "Let's Encrypt Client Development" <client-dev@xxxxxxxxxxxxxxx>
Date: Sun, 15 May 2016 01:07:33 -0400
Why ads?
Josh,

I suddenly found that https://helloworld.letsencrypt.org was determined by
not private on Chrome on Android 6.0.1/5.0.2 today. This is a very big
nasty surprise :(

What has changed on Android side?

Thanks for help,

/Kaiduan

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Why ads?