Cooking is not deterministic for Destructible Meshes. Can be tested by doing a release/patch of Destructibles map in Content Examples. Destructible Meshes that have not changed will show up in the patch.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-45856 in the post.
|Component||UE - Simulation - Physics - Destruction|
|Affects Versions||4.16, 4.20|
|Created||Jun 9, 2017|
|Resolved||Aug 18, 2021|
|Updated||Aug 18, 2021|