Example URL: https://archive.org/details/pastpages-lexpress-2013-03  and its torrent file.

The entire transfer is 5.24G of which 3.17G is the "_____padding_file" folder with zero-filled files. Due to archive.org creating such torrents BUT NOT storing the padding files on their webserver, Tixati will fail to download such webseed-backed transfers from the Internet Archive:
1. Tixati requests and downloads a regular file: Good
2. Tixati requests to download a padding file: 404, webseed-URL is stopped
3. The transfer stalls
Turning off the download of the padding folder has no effect on Tixati's behavior.

Basically there're two issues:
1. Tixati does not ignore padding files. There're two types: the unspecified file formats (ancient Bittorrent clients) and the (proposed) BEP-47 variant of padding files, where there's an attribute in meta-info with the letter 'p' for padding file (this variant is used by archive.org)
2. Webseed stalls the entire transfer due to (a few) missing files. I had expected the client to download everything that's available nonetheless.

If you want me to do some footwork for you, I can search for legacy clients and their padding files/folders formats.
Archive.org's reasoning is outlined here: https://archive.org/post/1068281/torrents-padding-files-are-a-problem

Thank you!