This is a good example of the problems with feature bloat and frequent useless software 'updates' that out-date previous hardware or are with previous versions e.g. microsloft and apple
It sounds to me that they have added another safety test in the EVSE, in addition to checking for ground faults and isolation, to check the resistance of the main contactors on the vehicle. If Mitsubishi didn't update their software to recognize this contactor test protocol, then it won't respond as expected by the Chademo station, and the station won't send the charge.
e.g. Apple won't let some apps run thru my wireless home router because it has upgraded their ios to only accept a newer wi-fi version that uses WPA2 security. WPA has been working fine, never a security threat. This might be useful for a big company but not for home use--there is no threat at home of someone stealing wi-fi when you use a passkey and MAC address filtering.