See linked UDN for more info. There appears to be an issue with mismatching parents when copying causing this to fail.

Steps to Reproduce
  1. Create a level sequence
  2. Add an event track to the sequence
  3. Add a key and event binding for the key
  4. Copy the track
  5. Paste the track in the sequence


The new track will have a greyed out event key, that will not have an event binding. 

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There's no existing public thread on this issue, so head over to AnswerHub just mention UE-121192 in the post.

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ComponentUE - Anim - Sequencer
Affects Versions4.26
Target Fix5.1
CreatedAug 6, 2021
UpdatedOct 8, 2021