Onion Skinning not showing correct deformers

Hello, I asked this here back in November to no avail and still have not found a solution. Hopefully it’s okay to ask again! I am using Harmony 21 Premium and onion skinning is not working properly for my deformers. It will not show the deformed contour point on the previous frames, acting as though the previous frames all have the same deformed shape. Is there any way to fix this?

Images to show what I mean. The tail is deformed differently on each frame, but the onion skin is not showing it properly. As if the tail is deformed the same on each frame, when it is not.

image
Tail2

Looks to be broken/bugged in Harmony 21.0.1, have you reported it to support?