Testing sample files, getting strange "Not actually a zip!?! (no magic number)" line endings, instead of status.:

testuser:log4j-detector testuser$ java -jar log4j-detector-2021年12月20日.jar ./test-files/
-- github.com/mergebase/log4j-detector v2021.12.20 (by mergebase.com) analyzing paths (could take a while).
-- Note: specify the '--verbose' flag to have every file examined printed to STDERR.
-- Problem: /Users/testuser/Desktop/log4j-detector/test-files/log4j-1.1.3.jar - Not actually a zip!?! (no magic number)
-- Problem: /Users/testuser/Desktop/log4j-detector/test-files/log4j-1.2.17.jar - Not actually a zip!?! (no magic number)
-- Problem: /Users/testuser/Desktop/log4j-detector/test-files/log4j-core-2.0-beta2.jar - Not actually a zip!?! (no magic number)
-- Problem: /Users/testuser/Desktop/log4j-detector/test-files/log4j-core-2.0-beta9.jar - Not actually a zip!?! (no magic number)
-- Problem: /Users/testuser/Desktop/log4j-detector/test-files/log4j-core-2.10.0.jar - Not actually a zip!?! (no magic number)
-- Problem: /Users/testuser/Desktop/log4j-detector/test-files/log4j-core-2.10.0.zip - Not actually a zip!?! (no magic number)
-- Problem: /Users/testuser/Desktop/log4j-detector/test-files/log4j-core-2.15.0.jar - Not actually a zip!?! (no magic number)
-- Problem: /Users/testuser/Desktop/log4j-detector/test-files/log4j-core-2.9.1.jar - Not actually a zip!?! (no magic number)
-- No vulnerable Log4J 2.x samples found in supplied paths: [./test-files/]
-- Congratulations, the supplied paths are not vulnerable to CVE-2021-44228 or CVE-2021-45046 ! :-)
testuser:log4j-detector testuser$