I don't believe there were any bugs like that reported since v5.5. Have you tried
/property:"XXX=ccc ccc;YYY=hhh jjj"
or
/property:"XXX=ccc ccc" /property:"YYY=hhh jjj"
Also, v6 has a built-in MSBuild action that simplifies this (and v5 is no longer being supported or updated).
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