Steps to reproduce:

1. Open attached project
2. Open atnimation window
3. In project tab select "Anim1" to preview it
4. Back in animation window, switch to curve view. Notice that top curve is only showing keyframes in the middle while they aren't connected with a curve
5. Multi select disconnected keys and try to move them
6. Notice IsFinite (key.value) assert in console

Reproduced with: 5.5.0a6, 5.5.0b7, 5.5.0b11