Thanks for the link. But this only explains how you bypass WP to control everything fully manually. And partially, I understand your arguments.
At the end of the page, in the very last paragraph, you than state that it is indeed possible, but I still don’t see how this is achieved.
What is the purpose of add_theme_support( ‘post-thumbnails’ ); file when you recommend to do it manually. Is it out of function at the moment?
According to feedback in the german WP forum, my theme would be is calling “the_excerpt”, and misses the call to “the_post_thumbnail” before that.
Not sure whether it would be so simple. My issue is now that I even cannot identify the php file(s) that are finally responsible for this part of the theme.
Can you please explain which file(s) I would have to modify? — I would like to try this in a child theme and see how far I get try to get some help.
At the end, it should look similar to your encounters demo page in the “last posts” widget (in footer and sidebar).