app.bsky.feed.getTimeline cursors stop working

[seboslaw]

Describe the bug

In my app I'm trying to save the user's scroll position in the timeline between app launches. But when trying to re-issue a saved cursor request to app.bsky.feed.getTimeline like https://porcini.us-east.host.bsky.network/xrpc/app.bsky.feed.getTimeline?cursor=2025-01-06T14:04:52.233Z&limit=30 (using a new accessToken) the backend suddenly returns an empty feed (when it did return items the last time the app was active). My guess is that the API will only let me query the timeline so far into the past. So if this is not a bug, please consider it a feature request.

To Reproduce

Steps to reproduce the behavior:

1. Do a request to getTimeline and save the request string
2. Repeat the request the next day (using a refreshed accessToken)

Expected behavior

I would expect to get the exact same results I got when I last issued the request.