Q. Only as few threads a returned when filtering by a prefix, when there are clearly more.
A. In some versions of MySQL changing join_cache_level above the standard "2" will interfere with the operation of this add-on
Q. How can the maximum prefix limit be set in bulk?
A. Run the following SQL;
set sv_min_prefixes = 0, sv_max_prefixes = 0
where node_id in (1,2,3)
Change the node_id list as required, and set sv_min_prefixes/sv_max_prefixes as required. A value of 0 means no limit.