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Actually, all diagram code except the canonical editpolicies had been migrated to the most recent GMF available, see #315056. The contents of the org.eclipse.uml2.diagram.<xxx>.edit.policies had not been migrated yet because GMF produces not compiliable code in multiple places here (see, #315246, #315454). However, while GMF seems to be unable to fix it after RC1, U2T should provide the fixes via its own custom templates, merge the templates/code with U2T specific canonical extensions, and thus complete migration to GMF2.3 release.
Templates merged, all diagrams regenerated. Thus its fixed now.