Filenames are not changed on OSx Mojave 10.14.6 and Kid3 v3.8.4

Hello Team,

I can't change the mp3 filenames according to the new downloaded tag information. What I did: I opend a folder with MP3 files. I checked and downloaded tag information from Discogs. I stored tag information in all tags. Automatic File change was On or Off, I'm not sure, but file names are still the old once. I checked the settings and turned the automatic off. I used "Extras" Dateinamenformat anwenden" ("Tools" -> "Apply File name format") but nothing happened. If I use "Umbenennen" from context menu I need to define the name by my own. Using variables for tags does not work here. I'm not sure if it is a bug or if it is me as the user. I kindly request some help and insight. Many thanks in advance.
KR Markus