Featured images disappear when in post lists only

Update:

I now was able to reproduce the behaviour. The problems occurs:

1- if the NextGen Gallery Plugin is activated AND

2- only when saving the post WITHOUT modifying the featured image. If the image is newly selected and saved, it will be included and shown correctly even if the option is activated.

The issue will be posted in the Plugin support forum and this threab be marked as “resolved” (even though that’s not exactly the case).