Hmm as you are using intersection types this might be related to https://github.com/gwtproject/gwt/commit/1ce1c710c7d3d7bffc246c7f013009b670be44a4 which has been committed between 2.8.0 and 2.8.2.--
So it could very well be that now there is a cast check inserted by GWT because you use an intersection type as return type of your getter.
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