Sure, I can post screenshots. Many of the ones that truncate actually do have the series name in the title in parenthesis. I didn't know this was a factor. But if I remove the parenthesis in Calibre and paste in more text it still cuts off the names of files and folders when saving to disk.
Here’s an example book title: “Enemy of the People: The Untold Story of the Journalists Who Opposed Hitler” by Terrence Petty. This is how it saves using the default “Save to Disk” template in Preferences w/ the latest Calibre 5.40 for macOS. In the 2nd image all folder/file names are truncated in the middle for some reason, even with the author folder which isn’t due to potentially having too many characters:
