Tony said the uploader doesn’t use EXIF time zone data:
I’m not totally sure how the web uploader is supposed to work currently, but you can try going over what Tony said here (and the two follow-up posts) and see if you think it’s working as intended.
To be honest, based on what he said I thought it was supposed to just slap the time zone of the coordinates (in this case -10:00) onto the EXIF-acquired datetime (in this case 17/04/2022 12:12 PM), but that wouldn’t explain why changing your computer’s time zone has an effect…