Why did Invincible's flight deck stop short at the stern?

Why did the Invincible class not extend the flight deck fully over the stern?

Deck organization, helicopter landing spots, and the operating needs of Harriers shaped the stern arrangement.

Deck arrangement and the need to organize helicopter landing spots shaped the stern. Harrier operating requirements also influenced which parts of the deck counted as useful launch and recovery space. The stern layout therefore needs to be understood in relation to the aircraft the ship was designed to operate.