The following tgz archive causes an error:
test_archive.tgz (190 Bytes)
Such archives are created by the python -m idf_component_manager component pack command.
test_archive.tgz (190 Bytes)
It contains a directory with an empty (zero characters) name, so Opus won't touch it in case it's a malicious archive trying to exploit path traversal issues or similar.
(The tool that made it should be fixed, IMO.)