In UE5.2, there seems to be a problem with the initialization of the reloaded LevelSequenceActor. SequencePlayer->Initialize is not called in ALevelSequenceActor::InitializePlayer() and Tick registration is not performed, so playback does not proceed.
Sequencer is played, but StaticMesh on the level does not rotate.
As in Step 3, Sequencer is played and StaticMesh on the level is rotated.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-199459 in the post.