What is tombstone_compaction_interval mean?

I read the doc

here is my table schema

ALTER TABLE foo.bar WITH compaction = {'class' :  'LeveledCompactionStrategy','tombstone_threshold' : 0.1,'sstable_size_in_mb' : 160, 'tombstone_compaction_interval': 60} 
AND gc_grace_seconds = 60 ;

I expected scylla will check sstable’s Estimated droppable tombstones
every 60s
if Estimated droppable tombstones > 0.1
then will exec minor compact for this table

but in my test
after I delete data
scylla don’t exec minor compact

or should I write same primary key, when scylla flush to sstable then will trigger minor compact ?