software version 11.60
I ran a max effort 5.3 miles today with 10 sprint intervals and on my 945 at the end of the run I reviewed the activity and saw it was labelled a Tempo run with 3.5 aerobic & 2.5 anaerobic. After I finished and my watch synced to my phone I opened the Garmin app to edit the run name, gear, etc and I noticed it had changed to a Base run. I assume this is a bug, there's no way this was a Base effort.
I suspect this may have been happening for a while because my Load Focus has been strangely lopsided towards Low Aerobic this past month with both an Anaerobic and High Aerobic shortage, even though I run sprints and high intensity runs weekly. Usually I have a Low Aerobic shortage, if I'm not Balanced. This was the first time I caught it changing for sure though after I synced the activity.