Thu Sep 24 2020 03:13:41 UTC
It's not a bug. It's an undocumented feature.
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ID Product Comp Assignee Status Resolution Summary Changed
55788 Tomcat 8 Jasper dev NEW --- TagPlugins should key on tag QName rather than implementation class 2013-11-16
57486 Tomcat 8 Jasper dev NEW --- Improve reuse of ProtectedFunctionMapper instances in generated JSP 2015-05-06
2 bugs found.

as

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