Ok, so this issue is due to the same origin as the one I told in this other topic : Automatic Hook Container doesn't use cue points
Whatever it’s created by scripts or by clock template or manually, it will work only if you use MMD files (at the moment).
Maybe truth is elsewhere and maybe it’s a bug : I let Torben see what it’s about.
So, you can use MMD files if you want it to work correctly for now (reminder : result got with a 7.3.6 build 5650 version)