Vortex cube planets more common in black hole systems?

Maybe I'm just baked, but I warped to a black hole system and the first planet I scanned was a vortex cube planet. That made me think back, and since Foundation, if my marijuana-affected memory serves me well, the last time I found a vortex cube planet was also a black hole system. Wondering if this is more of a pattern than coincidence. Has anyone else here noticed a correlation?