Seems that's the way a scene (sim and all) are saved in a PZ3: when you first open it, everything is at frame 1.

I found out something exciting (to me... yep, I need a life): I'd saved this Wow dress (with all the import-obj-set-constrained-group-sim-settings mix) as a smart prop in my props folder, and wow (pun intended :biggrin:), when I loaded the dress in another scene, all my sim settings were there. How cool is that!

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks