Disable "Optimize Storage" on Catalina
Here is how you can ensure iCloud does not take an optimize pass after it downloads the full version of cloud synced app data and finished processing and uploading any selected folders or selected Application data that only exists on your local Mac.

https://support.apple.com/guide/system-information/optimize-storage-space-sysp4ee93ca4/mac

In system preferences, at the very top, select AppleID and in the main pane, you can choose to opt in or opt out of syncing specific buckets of files. The equivalent check box is located at the bottom of that list -  Optimize Mac Storage.