Play times for launch-day titles are now being reset on Nintendo Switch profiles. This only appears to affect the play times listed in your user profile; save data for the titles in question remains unchanged, but you can no longer accurately see how many hours you’ve sunk into any games you first started playing on launch day. However, Nintendo is aware of the issue and is working on a fix that will be implemented via an upcoming patch for the console.
Source: Nintendo Support Japan
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