When you copy a clip from one timeline and paste it into another, the shortcut (CMD-V) does not work, but the contextual menu (RMB-Click on the clip) Paste option does paste the copied clip as expected.

repro:
- create a Timeline & animated a cube
- create a second timeline with the same cube binding on an empty Animation track
- select the first Timeline
- select the clip and use the shortcut (CMD-C) to copy the clip
- select the second Timeline, select the empty Animation track and use the shortcut (CMD-V) to paste the copied clip...
bug: nothing happens.
expected: clip is pasted on the empty track
workaround: use the contextual menu (RMB-Click on the clip) Paste option.

this is not a regression.