FTR it's about *en_GB.utf8* vs *en_GB.UTF-8*. For a moment I thought it's about ...

GrumpySloth on Nov 2, 2023 | parent | context | favorite | on: macOS Sonoma Broke Grep

FTR it's about en_GB.utf8 vs en_GB.UTF-8. For a moment I thought it's about lang vs LANG which would be expected behaviour IMO.