"Simulate Selected" overwrites "Physics Type" property when playing in Editor. In any subsequent PIE sessions SK_Mannequin will simulate physics even though the option is toggled off.
This was reported and tested in 4.22.3 (CL-7053642). This was reproduced in 4.23 (CL-8386587) and Main 4.24 (CL-850760)
Results: SkeletalMesh Actor in Level simulate physics and "Physics Type" property changed to "Simulated"
Expected: "Physics Type" property is not changed like when use "Simulate" button.
There's no existing public thread on this issue, so head over to AnswerHub just mention UE-79872 in the post.