Currently if you have a simple disk corona light drawn in plan facing down (classic ceiling light for example) or a long rectangular light, and you change it to Cylinder, its orientation is wrong and it seems to take the shortest dimension as the longest and visa versa.
A simple example would be that a 1m long by 0.5m wide rect light should "convert" into a cylindrical light that is 1m long by 0.5m in diameter - but it doesn't. It turns into 1m diameter and height of 0.5m. They just need to be reversed, basically.
