Sounds very strange… Although I may not have a proper answer, you may be able to find something from the new 5.1 features implemented: Unreal Engine 5.1 Release Notes | Unreal Engine 5.1 Documentation
Cooking Insights
Cooking Insights provides a profiling method to gather and display information about the way packages are cooked. To record a cook session, start from the command line using the argument
-trace=default,cook.When you enable the cook channels, this adds a panel to Timing Insights called Packages. This displays a list of all the packages associated with that cooking event. For each package, there are statistics available, including: LoadTime, SaveTime, BeginCache, IsCacheCooked, and Asset Class. Each of these is displayed in a column that can be grouped and sorted.
Use the option Grouping > Path Breakdown - Package Name to generate a collapsible hierarchy view of the data. You can also group by Asset Class.
