The only mention of this problem I’ve found was UE-50682, but it specifies only for clients on replication.
It is actually affecting even the server or single player, in editor.
I can’t even find any logic on how the issue works, sometimes rotating the object will make it start simulating physics, other times it won’t, but only if you used the rotate gizmo!
Here a video of it in action: ShareX GIF | Gfycat