Some post thumbnail is not showing on esteem app.

Expected behavior

I expect that i see all post main image as a thumbnail on esteem.
When reader watch the main photo on the post
It will help the reader to get some ideas about this post.

Actual behavior

When i open esteem app to check latest post on feed.
I noticed that some of the post main image is not showing.

Then i clicked my profile to check the main image of my post showing or not.
I found that , most the main images of post are not showing.

It's look like the picture below

Thumbnail does not show screenshot from esteem app

Thumbnail showed screenshot from chrome browser

How to reproduce

• Download Esteem latest version from Google play store ,
• Then install and run
• login with your Steemit username and the required login key
• Click on your profile or "Feed"
• You will find some post without thumbnail like my screenshot from esteem.
• Check this same post from your any browser.
  -Then you will see this post have thumbnail.
  -But the thumbnail is now showed on esteem.

Here is the information about my device

• Device used: Samsung Galaxy A7 (2017)
• Browser: eSteem Android app Version 1.6.0
• Operating system: Android version 7.0

Recording Of The Bug

[Note : I found a similar contribution about this topic , but there is so many different between two contribution. This contribution was posted about 6 months ago. bug is not same. That was an older version. esteem already updated new version. I hope dear moderator will be consider about the matter]