1: In Animation Set Editor , you should drag spy animation set to Lurker's Leathers animation set.
2: Then you may see the lock icon at the leftside of Lurker's Leathers animation set.
3: Expand the Lurker's Leathers animation set . Choose each bone which has the lock icon at the leftside . You can Leftclick the Lurker's Leathers animation set and Ctrl+Leftclick the bones without lock icon to avoid them.
4: You should find the control sliders (IDK what it calls and this is the translation English) in Procedural . It locates upper right of Animation Set Editor .
5: Drag Default/Zero/One control slider to the rightest. They do the same thing in this case. Just drag one .
6: And then it may be solved .