I am able to continue feeding necrocorns to the leviathans beyond my stated cap. Currently, I am at 696 / 405, and my trade ratios still seem to be increasing with more feeding despite being over the cap. I have 80 markers and 15 runs of black sky. I believe the 405 is calculated from the markers alone (5 + 5*markers per the wiki), so it seems the cap does not account for the bonus from black sky. The wiki says black sky increase is +0.5 per marker, capped at 10 with diminishing returns. Not sure where the diminishing returns kick in, but if I haven’t hit them yet I think my “real” cap will be at around 1000, not sure if I will stop being able to feed more then or if I will be able to continue feeding, just won’t improve my trade ratios? I am on mobile, not sure if this is a bug specific to mobile or if it would happen in browser too, I haven’t ever exported my save over.
Just an update, I reached 1005 energy, which is what I’d expect based on my black sky completions, and my energy caps out now. It seems it’s only the display of max possible energy that’s bugged