When wanting to paste a transform keyframe from one bone to another in the Dopesheet in v3.x.x. we would (as documented by the manual):
- select the keyframe and hit Ctrl-C to copy
- select the target bone to paste this transform to by clicking on the row of the bone in the dopesheet
- hit Ctrl-V to paste that keyframe to the other (selected) bone (Spine pastes this in the appropriate transform-channel of that bone)
In v3 this works, but in v4 this isn't working as Ctrl-V isn't pasting when selecting the target bone in the dopesheet in 4.0.20-beta. Hitting the paste-button in the dopesheet-view does work though. Also Ctrl-V IS working when we don't select the target bone by clicking on that row, but click on the row of the transform of that target bone. But that's not as convenient and obviously not meant to be necesary as the paste-button does work and the manual describes the target BONE needs to be selected.
So obviously the Ctrl-V shortcut functionality seems to be missing when a bone is selected in the dope sheet view.