During build a sparse disk is created with makefs (https://www.unix.com/man-page/freebsd/8/makefs). When using EA build it is taking storage for entire size, while on normal build it takes only based the contents inside disk.
command: makefs -t ffs -s 20g -f 240000 -Z abcd.ufs dir/
du -sh abcd.ufs - In EA 20+GB, normal build 1GB
Could you please take a look?