Translucent paint mode behaviour

Is it intended behaviour that “Translucent” paint mode not draw over layer transparent pixels?

It’s rather unintuitive when you create a new image, select the paint mode and can’t draw anything.

EDIT:
Just tried in 6.5 and it draws fine over transparent there, so I guess it’s a bug then?

EDIT:
Submitted bug report: https://mantis.cosmigo.com/view.php?id=1279

Thanks. I moved it to the bug section.