remaped M6 stdglue.py question

In my setup is a problem with stdglue.py, the version provided with linuxcnc. In my case, it's a remaped M6 (REMAP=M6  modalgroup=6 prolog=change_prolog ngc=change epilog=change_epilog), in terminal is printed 'emcTaskPlanLevel() returned 1' , linuxcnc.stat call_level returns 1 as well. It returns 1, until the final toolchange is done and then the returned value is 0.
If linuxcnc.stat call_level is 1, the preview in flexgui is disabled, and i try to find a way to solve that, but i have no idea what to change in stdglue.py.
If M6 is done without remap, everything works as expected.