I saw that if we record activities before syncing we get the 1989 dates as explained here: https://support.garmin.com/en-SG/?faq=Cz1AXmdDaA7OxiMyagIu9A
Now, I see in connect.garmin.com/modern that the activities seem to be shown with the correct date (the one set manually on the watch) but indeed if i download a .tcx I do see that the tag id (<id>) has the correct date, whereas all the time tags have those 1989 dates.
Is there any way to correct them?