labelposition attribute broken in Struts 2.5.27

Hello,

according to WW-5132 labelposition should be deprecated. But i get an error. 

With 2.5.26:

checkbox with unknown attribute: ignored

checkbox with labelposition:  ok

checkbox with labelPosition: ignored

With 2.5.27:

checkbox with unknown attribute: ignored

checkbox with labelposition:  JasperException

checkbox with labelPosition: ok

org.apache.jasper.JasperException: <file> (Zeile: [13], Spalte: [4]) Keine Setter Methode für das Attribut [labelposition] gefunden.

(Setter not found)

I'm using tiles.