Bug
The jurisdiction ValueSet (two code systems) reports total=789 but actually contains 1000+ concepts. The server appears to count only one of the included systems when computing total.
Repro
curl -s 'https://tx-dev.fhir.org/r4/ValueSet/$expand?url=http://hl7.org/fhir/ValueSet/jurisdiction&count=1000' \
-H 'Accept: application/fhir+json' | jq '{total: .expansion.total, returned: (.expansion.contains | length)}'
# Returns: {"total": 789, "returned": 1000}
# Expected: total >= returned