Any time I try to use it (contextual menu or Ctrl+Cmd + Space), half the time it doesn't even open and 3 out of 5 times I click one of the emoji and the window closes but doesn't actually insert the emoji. Happens on my iMac and my MacBook Pro (and the MacBook Pro has literally been wiped and set up fresh as of a few days ago with new logic board, not restored from backup).
Am I doing something wrong or is the macOS emoji picker just absolute garbage?