As noticed in T286354 despite the API showing that there are monuments in the "in-com_en" dataset the statistics page reported "Datasource (in-com, commons) is configured, but no monuments are in the database ".
The source is likely att least partially due to the dataset becoming named "in-com_en" but the statistics looking for "in-com_commons" i.e. in one case using the language of the site/dataset and in the other the project. While this is fine for lists on Wikipedia it fails on Commons and Wikidata.
"pt-wd_pt" suffers a similar fate despite the name of the dataset matching.