Same thing happened to me just now. UE 5.3.2 Third Personal Template with very little added code. On begin play character started constantly falling and the Character Mesh and everything in the the details panel disappeared, restarting had no effect.
-My solution was to simply create another third person template and migrate over the working 3rd person character to my project. Copy the code and settings from the first character to the second character, then I was back in action.
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