To me, it does look like all the cracks(1-6), or whatever they are, do come out from the cover wall towards the center. At first I thought maybe the top "crack", marked(1) in pictureIt looks like only 1 of the cracks lines up with an oil filter cover bolt
At Zoom-In it does looks like a crack and not like a shadow.
In the next month I plan to disassemble my Filter-Cover, if that happens I will downloading to here a photo for reference.
I'm also very curious to know what's going on there, especially because I personally have an oil leak from this area, the picture above: not strong leak, not dripping oil, but very wet.