During a hike last weekend, I hit an area with poor GPS reception. Not unexpectedly. this created a few bad points in the track ( https://connect.garmin.com/modern/activity/5672794796 ). I exported the GPX file to try and remove some of them (before I learned about repairing FIT files from user seilogramp). When removing the bad points, I also noticed about 29 of the good points, with correct location data, have incorrect dates of April 6 2019 or April 7 2019, while the remaining 986 points have the correct date (Oct 11, 2020).
I was just curious if this is a known issue with the 66i? It does seem like a bug so maybe it will be fixed in newer firmware?