Cannot add more than 2 catapults with angled flight deck

[thestick]

Even though I've discovered Angled flight decks at Level 20 Shipboard aircraft operation, I can not build aircraft carriers with angled flight decks. If I try to install more than 2 catapults on an aircraft carrier, I get the 'Ship class can only have 2 catapults' errorl

[tbr]

Only CV's gan get 4 catapults wuth angled deck, CVL's stay at 2. Do you design CVL's?

[thestick]

No, I was trying to build a 67,500 ton CV.