Meanings of disregarded on in English

But Space Regs are disregarded on Priority One missions.

She was sitting in a low chair near the fire, and an open book lay disregarded on her knee.

Yet while their voices can be disregarded on technical grounds, they have spoken too loudly even for Murdoch to ignore.

Every man sat without moving, simply listening, it seemed, with an extraordinary attention; some leaning forward, some back, with the papers disregarded on the table.