We present two defect rediscovery datasets mined from Bugzilla (supplementary to previously published datasets: Zenodo, http://doi.org/10.5281/zenodo.400614). These datasets capture data for two groups of open source software projects: LibreOffice and Gentoo. The datasets contain information about the inter-relationships among duplicate defects. File Descriptions libreoffice.csv - LibreOffice Defect Rediscovery dataset gentoo.csv - Gentoo Defect Rediscovery dataset libreoffice.relations.csv - Inter-relations of rediscovered defects of LibreOffice gentoo.relations.csv - Inter-relations of rediscovered defects of Gentoo