Fenix 5x: VO2 max graphs discrepancy

Does anyone know why the VO2 max is showing a value of 46 in the VO2 max graph and a value of 42 in the Performance Status graph. To consider that the last run was made a few days before the 42 value appeared in the Performance Status graph. Isn't VO2 max supposed to be recorded only with running and cycling?

Can anyone explain this?
Thanks
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