film – Why can I see through this astronaut on the Apollo 11 footage?

I’m not sure if this is the correct place to put this but I’d assume it’s a photography thing.

In this video
When Aldrin is climbing down the ladder of the lander I can see the horizon through him. Why is this?

I’d also like to add that this is not related to moon landing deniers just my own curiosity about how this happens.:]

Thanks guys