After a lab test, a manually set the LTHR in the connect app at 157(and synced). A couple of days ago, i run a lab test again, setting the LTHR in the connect app at 151. Synced, the value in the app and in the watch, section Settings-User Profile-HR and PZones-Heart Rate, the LTHR is correct at 151.
In the performance stats, on VO2Max status, is still shown at 157 though.
S/W Ver: 16.17