That's strange because they should be sending exactly the same data to your site in both cases. I can't imagine how the location data is missing from the one that posts automatically.

Yes, as I said, I assume that this is caused by my website. It also happens that when a new auto post is made, the previous checkin is also reset and the imported images are gone. Super strange. I suspect it has something to do with one of the plugins for caching or image optimization, but it will take a while to find out.

This is just my specific case where it would be helpful for me. But maybe there is also a general benefit to be able to disable this optionally for others, too.