Verified in 6.12.5 snap 2 (python39-pulpcore-3.18.25-1.el8pc.noarch)
Steps to verify:
On export SAT:
1) Set immediate download policy, uploaded manifest.
2) Synced RH repo big enough to be chunked (rhel-9-for-x86_64-baseos-rpms).
3) Exported complete Library using chunks:
# hammer content-export complete library --organization-id 1 --chunk-size-gb 1
On import SAT:
1) Set immediate download policy, uploaded manifest, set "Export Sync" in CDN configuration.
2) Created import dir, copied the content from the export SAT, updated owner.
# rsync -aPz root@$EXP_SAT:/var/lib/pulp/exports/Default_Organization/Export-Library/1.0/$TIME/ /var/lib/pulp/imports/$TIME/
# chown -R pulp:pulp /var/lib/pulp/imports/
3) Started the import and once the chunks were gone (merged into single tar.gz), restarted the services:
# hammer content-import library --organization="Default Organization" --path="/var/lib/pulp/imports/$TIME/"
# foreman-maintain service restart
4) Started the import again and let it finish -> the task succeeded.
5) Checked that the imported content matched the export.