FX layer expressions BREAK extra bone animations in locomotion layer

My avatar has a standard humanoid rig, but with 2 dozen extra bones attached to the feet which function as tentacles. They are infact added in to the mask so they can be animated, which I have done so for locomotion animations. However whenever I have any expressions on the FX layer active, the extra bones freeze in the default spawn position.

this is me with no expression, with my tentacles flailing when I walk as expected

but this is me with my face smiling, and my tentacles flat to the ground as I walk

does anyone know of a fix for this?

There’s too many way this can happen, can you show screenshot of the layer and animations align to the template?