In .hg/hgrc , paths.default is incorrectly escaped, eg:

default = ssh\://x.y.z\:4433

instead of:

default = ssh://x.y.z:4433

This causes the plugin to always choose to re-clone the workspace instead of using the existing.

Problem identified in mercurial plugin (MercurialSCM.java), and a naive fix to disable escaping in ini4j is attached (patched version is now being used locally).