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I recently reported the same for Ultimate DOOM (not the BFG Edition) with Build 2879, it got fixed with the next build. This probably slipped though, because manually cycling through the menu entry 'Read Me' does not trigger the error. The error is only reported when Doomsday cycles through it automatically during the title menu loop sequence.
Missing patch 'HELP2'. Failed to locate lump for "Patches:HELP2"