Yesterday I went on a walk I've done dozens of times; it's a little over 2 miles. Using the Venu 2 Plus as usual, I got the one-mile notification on the watch at the usual place and didn't look at it again until I finished. At that point the watch recorded my total distance as 1.16 miles, which is about half what it actually was! I thought maybe I had somehow paused it, but clearly it was still recording GPS points since it correctly showed the trace of the entire loop. In the summary it showed a total activity time of about 34 minutes at a 17 min/mile pace, but only came up with 1.16 miles??
Looking at the activity on the Connect website, it looks like there is a discontinuity in the track just after the 1.16 mile point, after which the GPS track picks up and goes to the end but my distance travelled stays stuck at 1.16 miles.
This all started with my first activity after the 13.14 update. I'll try another walk in the next day or two and see what happens, but this is the first bug of this kind that I've had in 20 years of using Garmin sports watches!