This didn’t change results so I put them back.
Ran procmon and filtered for
icudt53l with result
NAME NOT FOUND and got 8 hits for along with dozens for . Seems that most are innocuous, so I started at the bottom of the list for and copied files over from the zip. It only took 1 file:
Back up and running. I do have japanese language installed on this box although it wasn’t enabled in the language switcher, I don’t know much about i18n so unsure if it’s related