Sat Oct 19 2019 07:27:58 UTC
It's not a bug. It's an undocumented feature.
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ID Product Comp Assignee Status Resolution Summary Changed
57827 Tomcat 7 Cluster dev NEW --- Enable adding/removing of members via jmx in a static-membership cluster 2015-04-17
One bug found.

as

File a new bug in the "Cluster" component of the "Tomcat 7" product