Cannot specify ORDER BY of clustering columns after IN-clause constraints on clustering prefix

When a user specifies a partition key and clustering key prefix with equality predicates, C* supports sorting by the next clustering key (CASSANDRA-10271):

SELECT * FROM tbl WHERE pk = 1 AND ck1 = 1 ORDER BY ck2;

 
When a user specifies a partition key with a set-membership predicate, C* supports sorting by the next clustering key (requires merge sort of results for each pk):

SELECT * FROM tbl WHERE pk IN (1, 2) ORDER BY ck1;

 
But when a user specifies a partition key with an equality predicate and a clustering key prefix with a set membership predicate, C* does not support sorting by the next clustering key:

SELECT * FROM tbl WHERE pk = 1 AND ck1 IN (1, 2) ORDER BY ck2;
org.apache.cassandra.exceptions.InvalidRequestException: Order by currently only supports the ordering of columns following their declared order in the PRIMARY KEY

 
This last situation requires a merge sort, but so does the multi-pk situation.
 
The docs seem to indicate that this pattern is supported, as well: https://docs.datastax.com/en/cql-oss/3.3/cql/cql_using/useQueryIN.html