In numbered musical notation, the legatoorigin does not display an arc

[fanjielin]

The legatoOrigin in numbered musical notation does not display an arc, while sl does. However, in staff notation, legatoOrigin does display an arc. How can I make legatoOrigin display an arc ? Thank you!

[fanjielin]

如上图所有，2 和 3 之间本是有根弧线的，但是不显示

[Danielku15]

If you think there is a bug, please provide all information via bug form in the issue tracker. From the limited information you provided so far, its not possible for me to judge what is happening here.