Yes, the WDL code you've posted should work (I assume that the 'load' was a typo and meant 'level_load'). At least when I quickly try here a similar code, it works.

I'll look further into this. I'll be away next week, but will take care of this issue after my return. If I can not reproduce the problem, I might need your sample - maybe something in the resource prevent the level_load from functioning.