Hey,
So I went through your repro steps and I couldn’t replicate the issue in 4.18.
- I made a new first person project
- Added a toggle for Global Time Dilation. Set it 0.1 and 1
- Made a cube actor with simulate physics on
- Added a stack of cubes and tested the Global Time Dilation with them
Results: They acted “normal” as in they didn’t move when I toggled between the Global Time Dilations. When I knocked them down they fell as they should. However for the ragdolls and other skeletal mesh actors the result you got is expected behavior due to limitations with PhysX. If you could, can you send me the project you replicated this is in so I can see the issue with your cube actors?