Lucene Plugin: Custom Results Ranking Has No Effect

Hello,

Using OJS 3.3.0.15 with a fully up-to-date Lucene plugin for that version. A journal has a section for advertisements; we wish to either exclude this section’s content from search results, or weight it towards the bottom. In Lucene, we have activated the custom ranking feature, and for the advertisement section we have both “Never Show” selected in the Custom Ranking settings and the checkbox option to exclude from indexing:

After re-indexing and cache-clearing, the first search result is nevertheless from the advertisement section:

Have tried toggling the checkbox setting off and re-indexing; no change. With the checkbox deselected, have tried “Rank Lower” rank setting; no change. It seems no matter how we attempt to affect the results list, nothing changes.