When creating a Notify Track using an Animation Modifier in the Animation tab of an Animation Sequence, the new Track added and applied fails to appear in the Notifies panel until the panel has been collapsed and expanded.
Reported and tested in version 4.25.3 (CL-13942748) and version 4.24.3 (CL-11590370)
Error not appearing in 4.24.3; UI has changed between that and version 4.25.3.
Results: Notify Track is not listed. If you collapse and expand Notify Tracks, the new Track appears.
Expected: When tracks are modified externally (using the Animation Data Modifier), the Animation Editor should refresh. Or - the Animation Editor should refresh automatically after any Animation Data Modifier was run and finished.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-96789 in the post.