1. Create a Project from ThirdPerson Template.
2. Add a RigidBody Node to the ThirdPerson_AnimBP and link it with Default State Machine and Final Animation Pose.
3. Create a LevelSequencer.
4. Select the ThirdPersonCharacter in the level and add it to the Sequencer.
5. Right-Click the ThirdPersonCharacter in Sequencer and choose Convert to Spawnable.
The project will crash.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-68762 in the post.