Round corners and font Round corners are ineffective on some corners

Is it a problem with the corners or with G3?

Can you post a screenshot of the original outline?

The original outline doesn’t seem to have any extra points.

The original outline doesn’t seem to have any extra points.

It seems that you have TrueType outlines?

yes,TTF.

The corner filter needs cubic curves. Convert them with Path > Other > Convert to Cubic.

thanks.