How does M73 work in a sub?

Hello,

Writing a sub that can cut a part in a specified direction, I assumed that M73 will restore the former state - including rotation - upon subroutine exit. Since I could not get it right, I made a small test:
; test to see if the Rotation in the current coordinate system is saved with M73

o<rotating> sub
M73
G10 L2 P0 x10y10 R#1 ; rotate some degrees at current position
G90 X5 ; draw a line in relative mode
o<rotating> endsub

; Begin main
G91 G0
x10y10
o<rotating> call [10]
x10y10
o<rotating> call [20]
x10y10
o<rotating> call [30]
x10y10
o<rotating> call [40]
M2

Expecting a star of lines around 10,10
Running this seems that nor the rotation, nor the absolute mode is restored?
What goes wrong here? Using LinuxCNC 2.7.14

Thanks, Elco

Thanks for the reply. I'll add that to the code.

Elco