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Lactate Threshold HR Zones changed after 19.20 update - Fenix 6s Pro

I updated to 19.2 at the end of last week and completed 2 runs yesterday. (Neither of which asked me to update my Lactate Threahold data) I noticed the zones in the statistics were different to Thursday (when I actually was running based on the HR Zone). Looking into the user settings on the device I can see the percentages and values are different to what they were. Attached is a screenshot of the difference (Left is original - obtained by pressing reset, Right is current settings after the update)

Is this a deliberate change or recalculation to LT, or a bug?