I've now had this happen to me three times, as others note with the clock wrong and lean angle, riding hours ave MPG, etc wiped.
I've now got it booked into Bournemouth Kawasaki as last night it got more serious. I was checking all lights & indicators were working and the dash just went dead. The side and tail lights remained on, but hugely reduced in brightness. I did not want to damage anything by trying to start the bike so left it to this morning. Everything came on as normal but sure enough the clock, etc. were wrong. Also the quickshifter had been turned off! I thought it was not working, but went into the dash and it was off.
I mentioned to BK that this seemed to be a problem with 2020 models but this was the first that they had heard of it. It's in on the 29th.