Broken release tarfile
The bzipped tar archive produced for the 0.9.4 release was broken. There were errors about
@PaxHeader with 7zip, and several others failed too.
Sounds like the default format on python tarfile has changed:
Changed in version 3.8: The default format for new archives was changed to PAX_FORMAT from GNU_FORMAT.
Maybe just switch back to old default would be enough. Note Maps and Events plugins are also impacted.