If you already set a facial scene and want to add an object typically the eylashes, you need to reset the scene manually.
If you didn't set the group, this need to be set manually also.
Mimic this setup :

Delete the blendShape nodes, and recreate them with this rules :
- FCL_eyelashes_MESH_primary added to FCL_head_MESH_GRP_primary is skin at 100% to FCL_head_HOLD
- FCL_head_MESH_GRP_primary is a blendShape of FCL_head_MESH_GRP_BS and this node is called FCL_blendShape2
- FCL_blendShape2 will also receive blendShape from the Modeler. Eyelashes need to be on all the groups if they are not. The group from mod is FCL_head_MESH_GRP_BSuser

The *BSuser come from the modeler scene.
- FCL_head_MESH_GRP_BS is a blend shape of FCL_head_MESH_GRP_secondary and this name is called blendShape_secondary
- FCL_eyelashes_MESH_BS is skinned with the eyelids

- FCL_eyelashes_MESH_secondary is skin at 100% on FCL_head_HOLD
Additionnaly, make sure all infos in FCL_tags fit to your scene. If you set the facial with intermediate group, this should be ok. If not, you would have to adapt some infos

Also, make sure the group in the final BASE scene fit.