I'm using Y in Korea, 2021, May, manufactured on Fremont.
(1) July ~ mid Aug. in Korea, It had really hot weather rather than previous.
(2) After mid Aug. Heavy rain about 2 weeks across the nation (S. Korea size is a little bit smaller than California, rain covers almost all these country)
Time in (1) very humid, thus there may be many A/C drain water was one of the causality.
In case (2), Many new born car (which has just under 10 mile drive) also had leakage.
Upper California so dry and lack of rain except Feb.
And most of Model Y, perhaps in the Garage of House.
Because of different weather, Korea seems to find this issue, earlier than others.