I upgraded last week and today I investigated this firmware version a bit. From the release notes:

Release 2.2.0 – 21.02.2018

• Stability improvements and bugfixing

Bugs I have found to be fixed

• In the Homebus 1.0 protocol, Wi-Fi devices will no longer return HTTP code 500 (internal error) when in state “Waiting to Start” (numeric value: 4)

Bugs (still) not fixed

• The additional name for my dishwasher (“Dishwasher”), keeps changing to “Washing machine” from time to time.
• The ElapsedTime value for my Wi-Fi dishwasher is always:

  "ElapsedTime":[0,0]

New bug found: After a power outage today, my washing machine showed up as “mac-001d65feff02237b” (obscured a bit due to general paranoia) instead of its UID. I was still able to access it through http://GATEWAY/Rest/Devices/mac-001d65feff02237b/Ident, though. After another reboot, it was back to normal.