Sun Feb 23 2020 04:57:38 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 2020-01-02
58935 Tomcat 8 Manager dev REOP --- Re-deploy from war without deleting context 2017-02-09
2 bugs found.

as

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