There appears to be a glitch currently impacting some Google Maps users, causing their historical Timeline data to vanish.

Some Google Maps users are reporting their Timeline history has disappeared, even though location tracking is enabled

Google Maps timelines are disappearing, and not only is there no guaranteed fix for the issue right now, it isn’t clear if this is a permanent removal or only a temporary glitch. At first glance, reports of people’s timelines being lost seems like they might have fallen afoul of Google Map’s big privacy change: your Google Maps timeline is moving from the cloud to your device,

A glitch has been purging timeline data on Google Maps, and nobody is sure whether they'll be able to get it back or not.

A software bug in Google Maps — the most popular navigation service on Android and iOS — is causing Timeline data to vanish for users without warning. According to threads on Reddit, many Google Maps users have discovered years of saved location data has suddenly disappeared from their accounts.