A new stable release candidate hwloc 2.12.2 was published to bring several fixes.
v2.12 might be the last major release before the new v3.0 appears (hopefully in 2025). v3.0 will slightly break the API and ABI, remove support from obsolete hardware, etc. Additional v2.12.x stable releases if necessary will be published in parallel to the v3.0 development and early releases.