What are the different icons in the Space station hub

[Shuisman]

So when you drop something from a Space station hub to a planet the icon in the drop slots can have three states:
'normal'
'completely orange'
'partly overlayed orange'

See the images below:

halfOrange.png (34.97 KiB) Viewed 210 times

orangespoilage.png (96.94 KiB) Viewed 210 times

How are the three different? What is the meaning?

[Nidan]

You can ignore the "completely orange" case, that's a bug that got fixed in 2.0.29

Changelog

Fixed bad rendering logic for space platform trash slots. (124916)

The "partial orange" case I haven't seen myself yet, but my guess would be the time until the station can send another drop pod.