The pom file for the zktheme project seems corrupted in version >8.5.0

https://maven.zkoss.org/repo/zk/ee/org/zkoss/theme/zktheme/8.5.0/zktheme-8.5.0.pom ( OK - text file)

https://maven.zkoss.org/repo/zk/ee/org/zkoss/theme/zktheme/8.5.1/zktheme-8.5.1.pom (FAIL - looks like a binary file)

https://maven.zkoss.org/repo/zk/ee/org/zkoss/theme/zktheme/8.5.1.1/zktheme-8.5.1.1pom
(FAIL - looks like a binary file)

This corrupt file can lead to tooling problems when resolving maven dependencies of any ZK theme where zktheme is the parent project