LWT write shows as SERIAL CL

Using DataStax Java driver version 4.17.0 against Cassandra version 4.1.4, a LOCAL_QUORUM lightweight-transaction write to the same DC as a single-DC keyspace shows a Write-SERIAL rather than a Write-LOCAL_SERIAL statistic. Is this expected behavior? I haven't dug into whether the LWT is accessing remote DCs; this would be undesirable behavior. Should it?