Duplicate or not
Permalink 1 user found helpfulThere's even a record in blockrelations.
I tried to find a problem in block.php but couldn't find anything. Probably takes a bit longer to understand it completely..
does anyone have an idea why this happens? It's a bit difficult to give you more details, it just happens every once a while.

Different blocks but the only block of c5 is the slideshow block.
I try to understand when you call "duplicate". The method that creates the block relation. I don't exactly understand the way this works yet.