WeChat thumbnail disappears when shared from the in-app browser - social-networking

Issue:
When a user shares a webpage from a mobile browser's share menu to WeChat, a thumbnail image is rendered with that link as intended (the open graph image is populated). If the user opens that link, the WeChat's in-app browser is opened. Now, when user clicks to share that link from within the in-app browser, the thumbnail is no longer there (empty thumbnail link is displayed).
Question:
What is different about WeChat's in-app browser that makes it so the open graph image is not captured in the thumbnail like it is when shared via a normal browser (Chrome, Firefox, Safari).
Thank you in advance.

WeChat Provides a JSSDK, with the Share API in it you can specify the title, link, thumbnail, desc, etc of share behavior of current open page inside in-WeChat-browser.
For Example, I have a Page, title: A, link: www.a.com:
Without API, the share behavior is normal with title: A, link: www.a.com, thumbnail will be the first image in the webpage, and WeChat will grab some text for description.
With the API setup (code blow), the share behavior can be totally different: title: b, link: www.b.com, image: b.jpg, etc.
wx.onMenuShareTimeline({
title: 'b',
link: 'www.b.com',
imgUrl: 'image/to/b.jpg'
});

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When I check the source of that "image", The link looks like this:
https://MYCOMPANY.sharepoint.com/THISPROJECTPATH/_layouts/15/AppMonitoringChart.aspx?Launches=Days&Data=0|0|0|0|0|0|0|2|1|0|0|0|4|0|0|0|0|0|0|0|0|1|1|0|0|0|2|0
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OK, so I used facebook open graph object debugger on the url (https://developers.facebook.com/tools/debug/) and found that
og:image was not defined, could not be downloaded or was not big enough. Please define a chosen image using the og:image metatag, and use an image that's at least 200x200px and is accessible from Facebook. Image 'https://business.yell.com/knowledge/wp-content/uploads/2014/12/Anna-Bravington_avatar_1418999410.jpg' will be used instead.
If I send a different thumbnail image to FB it uses it but G+ for some reason (which I don't know what it is yet) ignores it.
Based on GooglePage api docs, there are 2 ways to posting an article with an image:
Article with an image from Google+ photos : Upload your image to Google+ photos. The image can be any public image from Google+ photos belonging to your Google+ Pages account — the image does not have to be from your target article page. You specify your post (Article) with the image's url using the direct URL returned by the Media.insert method. (Do not specify a private image as its rendering is undefined.)
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