Strange behavior was observed after upgrading a medium-sized (3 ensemble servers, 5 total root containers, around 7 child containers per root container) from Fuse 6.2.1 GA/084 to Fuse 6.2.1 R8/211. The behavior seems to have manifested after initially upgrading, rolling back, then re-upgrading to the rollup. Observed symptoms include containers reported in fabric as being on the patched (later version), but containers have the earlier (unpatched) git repo version checked out with committed and uncommitted changes, causing provisioning errors across the cluster.
We noted that rolling containers back undoes the manual lib replacements needed for application of rollup. Possibly this has something to do with the behavior, but no error or warning about lib removal for org.apache.karaf.exception lib was reported during the second upgrade.