Sometimes it really is. Sometimes ;-).
Here’s a screenshots of some different cases:
1. When using the banner:
2. When using featured image:
3. When using a picture that has nothing to do with the post:
4. When there is no picture at all:
And sometimes I have the opportunity to choose from several pictures that I like most 😉 but rarely happens.
I tried clearing all kinds of cache: on the server, on my computer’s browser etc., but there was no change.
This is not so important, but I want to understand the logic of things.
Thanks for your attention!