The custom sort order specified contains one or more invalid column names: product%20DESC%2Cbug_status%2Cshort_desc%2Cpriority%2Cassigned_to%2Cbug_id. They have been removed from the sort list.
Fri Apr 26 2024 08:20:13 UTC
It's not a bug. It's an undocumented feature.
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ID Product Comp Assignee Status Resolution Summary Changed
46769 POI POIFS dev RESO DUPL CustomProperties.containsKey(key) 2009-02-25
One bug found.

as

File a new bug in the "POIFS" component of the "POI" product