No Data despite data existing in the buckets

- [x] I am on the [latest](https://github.com/ActivityWatch/activitywatch/releases/latest) ActivityWatch version.
- [x] I have searched the issues of this repo and believe that this is not a duplicate.

- **OS name and version**: NixOS 23.05
- **ActivityWatch version**: 0.12.2 (rust)

## Describe the bug

I'm missing data for a about 14 days.

I checked the JSON of my buckets: They do contain a bunch of events, which dont look mangled in any way.
The timeline view shows the data properly.

So yeah. Whats happening here?

## To Reproduce

1. have aw-qt in your autostart
2. have modules enabled
3. everything works for months

## Expected behavior

Not losing data.

## Documentation

Today: only half of todays events are tracked:

My example will be the 14th december.

No data for previous days:

Timeline works:

## Additional context