selectItemGroup not implemented

Error: /spec1563IT.xhtml at line 26 and column 56 <f:selectItemGroup> Tag Library supports namespace: jakarta.faces.core, but no tag was defined for name: selectItemGroup


It looks like selectItemGroups was added, but not just the singular version.  (see https://github.com/apache/myfaces/commit/edf6e7cf25504097d9c2aa45f8517665097d56fc)