I don’t recall seeing this before, but I’m getting some instances where the track length is being removed from the track, and that’s not even a tag I can specify to preserve …
I thought that this was figured out from the file itself?
It was there at some prior time when I saved these tracks. I’ve never seen a blank length in my filenames. (I have
[%_length%] unconditionally in the Naming Script) You can see
?m??s on there for the New Value, and a saved track below with  in it’s filename.
This isn’t global, but I do have several albums loaded at the moment that are showing no length values. …
Only Track #14 has a time value showing.