Sun Sep 22 2019 01:39:21 UTC
It's not a bug. It's an undocumented feature.
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ID Product Comp Assignee Status Resolution Summary Changed
57701 Tomcat 8 Manager dev NEW --- Implement "[Redeploy]" button for a web application 2016-07-29
58577 Tomcat 8 Manager dev NEW --- JMX Proxy Servlet can't handle overloaded methods 2015-11-03
58935 Tomcat 8 Manager dev REOP --- Re-deploy from war without deleting context 2017-02-09
3 bugs found.

as

File a new bug in the "Manager" component of the "Tomcat 8" product