Wed Oct 28 2020 19:53:34 UTC
It's not a bug. It's an undocumented feature.
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ID Product Comp Assignee Status Resolution Summary Changed
48848 Taglibs Standard dev RESO DUPL fn:endsWith fails with repeated search string 2010-03-22
One bug found.

as

File a new bug in the "Standard Taglib" component of the "Taglibs" product