I tried using auto pause for hiking in hopes actual distance on my Instinct would equal what my hike partner sees on an Apple watch and All Trails app but once I start hiking, the Instinct would pause after a few seconds even thought I was moving. I turned it off. Garmin may as well remove that option.
I had the same issue today on my Fenix 7X. It cut 4km of my hike. I’ve tested it with it turned off and it works. I’ve set custom to 1.6km and that works, but I’ll just keep it turned off. It must be a bug as I’ve never had this issue with Garmin before.