Animation Sequence Keyframe icons missing after adding a Keyframe

Regression: Tested in UE5/Release-5.0 at CL 20979098, this issue occurs there as well so this is not a regression.

This issue occurs with any bone and setting any amount of Keyframes on any frame. Keyframe icons only appear when double clicking an Additive Layer Track to get into the Curve Editor.

1. Create a new 3rd Person Template project
2. Open MF_Run_Fwd Animation Sequence asset
3. Set the animation to any frame
4. In the Skeleton Tree window, select a bone and move it
5. Click the Key button at the top to add a Keyframe to Additive Layer Tracks

Actual Result: Keyframe gets added, but the triangle to show where the Keyframe is does not appear

Expected Result: Triangle icon to show there is a Keyframe on the curve should appear in the Additive Layer Tracks section