In Nature isn't the moon light leaking?
1. Pin holes around stitching
2. Gaps in vent holes
I don't think pin-hole leaks matter much. The flaps around the bottom can let in a lot of light (especially if high air flow is lifting them). I use cardboard (2' wide, however long as the edge of the tent), paint it flat black, and prop it against the base of the tent to create a darkened tunnel, shading the vents. That reduces how direct the light is.
For pin holes, you can smear some "Goop shoe glue" on them (I haven't done this. I don't think pinhole light is bad). Zip yourself in the tent and see what it looks like. The zipper can let light in where all three come together at the top. You can use Ecco paperclips to clip a 6x6" piece of cardboard to that top zipper flap, and block that part.
I think color temperature, how direct the light is, and how abruptly it happens makes a different. The moon gradually goes from new to full. I think an outdoor plant can adapt to that rather than a sudden source of light. Moonlight (at least reflect around us) looks like cool white. It's actually warmer than you'd think. But, it's not 2700k like a household lightbulb on your table lamp, which might enter through the flap.
I think there's something about the distance. Under a full moon, things seem bright. But, the source is still hundreds of thousands of miles away. It's like a cool glow from everything around you being dimly lit. A table light might be just 8' away. If that passes through the vent flap (in addition to the color temperature being more "flowery") the intensity could be more like a beam than just a soft glow. (That's why I use those black cardboard shades around the base of the tent. I'm not trying to prevent *any* light from getting into the tent. I just don't want direct a direct beam of light. If there's a soft glow of light around the vents, I'm ok with that. (You can improve those flaps by clipping some black poster board onto them. Make the flaps extend further past the mesh opening. The air flow will still lift them. It just wont be as "full on" light from the outside.
You could make the outside lean-to (that I use) more like a baffle. Use a 12x12" box that's very long (or tape a few together to make a long one). Stagger baffles inside the box for the air to travel through while blocking direct light. If you really wanted to, you could make those vents dark that way.
You can also tape those flaps down (inside the tent) and use 4" or 6" ducting as the inlet for air. You should have a couple of those openings at the bottom of the tent. You can buy plastic or steel flanges that you can install anywhere on the side of the tent, and connect ducting to. you could make your tent look like an octopus with 8 silver tentacles snaking around the bottom outside.