REGRESSION: Yes. Issue occurs in 4.15, but does not occur in 4.14.3
When the user deletes a curve from a pose asset, the mesh will revert to default pose, even if it was showing a pose. The Pose's weight will not be updated.
RESULT
The curve is deleted, and though Shocked is still set to 1, the mesh goes into A-pose.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-44024 in the post.