With 5.4 I have moved all the animation part of Lyra to my project and I have done an automatic retargeting of all the blueprints animations.
Everything worked wonderfully except for the animation sequences with additive settings that have not been created.
I guess it’s a bug.
As an additional note, my charactes are created with Character creator which has the bones system from Unreal 4
I have tried to create an editor utility but it does not seem exposed in blueprints the “base pose animation”
It also seems that the blend profiles are not created in the new skeleton, The field become empty but maintains the reference to the skeleton to which the retarget was made under the hood.