21.19 tweaking lactate threshold?

Folllowing installing 21.19, my lactate threshold changed in the absence of any additional workout. How come? There is no mention of any tweak to the lactate threshold algorithm in the release notes.

0 CRB 6 days ago

Same here. I've also found lactate threshold updates are very hit and miss since the addition of the wrist based readings. I always use a strap but now it only updates occasionally for me, even though I do a lot of threshold runs.