Solved by Sorgelig (does not pass plustest.dsk testbench 5 in r005.8.16.2 but does pass it on Sorgelig MiSTer fork version)
In fact it is more difficult instruction that I was thinking, if you watch at it, it shall take only 4 NOPs maximum but in plustest.dsk it does take 6/4 NOPs. In fact C9 RET seem also used here, as sub instruction. Do I remark that CPD and CPI does take 4 NOPs, so here CPDR/CPIR does not has same implementation than CPD/CPI.(so I was wrong : CPIR/CPIR is implemented in T80)
Done in r005.8.16.4 : just added a TState (TStates <= "110";) on case 3, that way plustest.dsk tb 5 full OK on it)does succeed.
==== Z80: TODO : cpc-power testbench ====