_music_loop don't work anymore

Using _music_loop for looping songs don't seems to work anymore one example is:

mus Turnabout Sisters 2016 - Intro
set _music_loop Turnabout Sisters 2016 - Loop

Works perfectly on 0.9880 but here:

mus Turnabout Sisters 2016 - Intro

Only mus gets called but ignores the line set _music_loop

I verified this running the Pywright Interactive Tutorial found in CR.NET

EDIT: it seems the loop works if you change to a scene and then return to an old scene