I figured out how it works. When a player has the maximum amount of food/water/air, he can still try to take more. The action will be completed, let's say, at 95 percent, and next time there will be those five percent left, which will allow the action to be completed almost instantly. So it's not a bug.
Second time I can't leave Talos with rover. averyraine already reported this problem. https://ctxt.io/2/AAB4wYN5Eg
I bought the game on Steam for about $3.14 in my region. Three days was enough to see the new content. Initially, I was traveling through all the old areas, but it was too time-consuming, and eventually Strabo ran out of power, so I just stuck with Laurion later on. And I never used the combined action in Santorini, which offered to grab resources/a suit and return to the rover, since usually the first thing you do is call a drill/tram. Anyway, thanks for the update!