Hi Jannis,
I am using Gallery3 with TCMS. (Grid: Grid-A-Licious, Lightbox: lightGallery) and came across an unwanted behavior.
As soon as I add a blog list (with a completely different tcms ID that is completely independent from the actual blog post) to the blog post page. The lightbox does not open anymore. Instead the picture simply opens in the browser.
I cannot share a link to site publicly, but the issue is very easy to reproduce.