M100 on subroutine hangs

I'm trying to execute an M100 from this toolchange subroutine, whithout M100 works. Here is the M100 and it works in MDI, what can cause the hang? 

#!/bin/bash
# M100 Orient Spindle (Homing function)
halcmd sets s-index-zero-for-ATC true
exit 0

 
 

Maybe try #!/usr/bin/env bash

(never hurts to try)

Did the subroutine execute?

You could run

halcmd show signal s-index-zero-for-ATC

From the command line to check

I have tryed both, unfortunately #!/usr/bin/env bash makes no difference. Also halcmd show signal s-index-zero-for-ATC stays false. I also tryed to call M100 from a remapped M19 but it's totally ignored, meanwhile the same sintax for similar commands like M10 or M21 works fine.

UPDATE: somehow in toolchange.ngc M1xx doesn't work, just hang the M6Tx called BUT I noticed it works inside the subroutines called by toolchange.ngc, like M10 (remapped) so I temporarly solved.  What it could be the cause?