Hi @sakuraime ,
> will the original mdf for that database grow 10GB due to version store
No. The extra versioning information leads the mdf file growing, but the size will less than 10 GB. There is a new asynchronous cleaner process, which iterates through all relevant databases (similar to ghost cleanup) and deallocates unneeded page versions. It runs every minute.
Suggest you to read the blog Accelerated Database Recovery in SQL Server 2019 and How Does Accelerated Database Recovery Work?