Changelog of the 1.6 version :

Update to the 1.19.3

• Fix the toggles messages; the output message was the inverse of the behavior of the pack
• Internal version is now 29
• Parameters of version 28 with toggles will not be inverted if you update to this pack; So the actual behavior will not be changed despites the message displayed when you toggled the settings. If you aren't sure of which parameter, use function headsdrop:cmd/on-off-drops or function headsdrop:cmd/on-off-advancement.