Changes in Physics? (UE 5.0)

I just noticed something bizarre in my demo I have been working on since earlier this year. When I built my project in Unreal Engine 4.26 and 4.27, the physics worked fine. That is, when objects are pushed along and their physics are only simulated when touched by the player actor, they move along. But now, when I push against those objects, they almost never move except when they feel like it.

So, what changes have been made to the physics and what can I do to fix the collision?

People really should start reading patch notes when switching major versions…

Yes they switched from PhysX Engine to Chaos Engine. There are several threads about it in the forum.

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It didn’t occur to me that it was a patch thing. Anyway, I found I was looking at the wrong project file. The one I’m actually working on works just fine, including the physics, thankfully.

By the way, how do I change the physics in an existing project from PhysX to Chaos? Do I need to do that manually?