Misschien helpt dit ?, met dank voor de hint van @Orange:
Steps to reproduce:
Create 7-Zip archive with password (I tried different passwords like as '123', 'test', 'Te$t' and etc)
Try to unpack file.
The password dialog keeps re-appearing over and over, and never extracts file (as if the password doesn't match)
Note: File successfully extracted from command prompt with:
open -a Keka test-keka.7z