All timeline data completely disappeared
I've had timeline on ever since they changed it to on-device storage, and I changed the deletion policy to never. When I checked yesterday (and today), it just says "no visits for this day". I checked my history. Everything is gone. When I tried to use Google Takeout to get my data, I only get an 18MB JSON file, which is not right, that's very small given my history.
Is this a bug? Is there a way to recover my data? I'm already in the process of moving to Dawarich+OwnTracks so that this doesn't happen again, but I do want my entire 10+ years of data back.