Unicode text triggers a force close on curved text

Black sun with rays, U+2600
Black star U+2605 renders as sun with rays plus some other characters.
Eighth note U+266A renders as (female symbol)f (backtick) 200 (backtick) 100"
Interestingly, they're fine on flat text. Curved text top is most broken and most likely to crash; curved text bottom (if it doesn't force-close before you can get to it) is less wrong. Toggling between them compounds the errors.