thanks very much for the file @werve !!
I’ve tested converting the archive and found that the test2 folder that is inside the archive is omitted when converting.
Also, PowerArchiver shows a CRC error when extracting the same archive.
In further testing, tried converting https://mattmahoney.net/dc/silesia.zip and that worked properly.
We have logged the issue in and will take a look to fix it.
Thanks again very much for your help!