The following genes with an identifier have been found but that do not have a mapping to Ensembl: 3
http://classic.wikipathways.org/instance/WP5038_r134348 IFN-I with datasource Entrez Gene
http://classic.wikipathways.org/instance/WP5038_r134348 nsp13 with datasource Wikidata
http://classic.wikipathways.org/instance/WP5038_r134348 orf6 with datasource UniProtKB
More details at https://www.wikipathways.org/WikiPathwaysCurator/GeneTests/genesWithoutEnsemblMapping