Brace Layer in component does not working in Variable Font

I use brace layer and it work in exporting OTF, however it doesn’t work in variable font.

I have 2 masters for weight axis, and I made some brace layers at 400 weight for adjusting some ink trap for shoulder and bowl components. (shoulder for n, h and u / bowl for a, b, d, p and q)

When I don’t use “Decompose Components in Variable Font” parameter, components don’t work like this:

However brace layer don’t work in variable font with “Decompose Components in Variable Font” parameter like this:

Does anyone know some solutions?
Thanks in advance!