Wait, what? Since when? I'm regulary reading using the chronogical timeline and I'm not seeing anything like you describe (I only see that using the "for you" algo timeline). Very concerning anyway. :(

Oh, it seems it was reset to use the algorithmic one. I for sure did not change that myself...

Thx for making me double check

Ah! Yes, since they rolled out the For You/Timeline things, the apps tend sometimes to revert to For you randomly for no reason...

One of my alts gets switched everytime, while my main account does not. All using them from the same iOS app.

It happens whenever the app reloads. If you swipe up (on iOS) to quit the app and then re-open it, you'll see it start off on For You.

What do you mean by "reload" ? I just tried on iOS to "exit" the app (swipe up in task manager), restart the app: it kept showing me the chronological timeline, like I picked last time.

Also- this random behavior is totally different on my couple of alts on the same iOS app.

Well, your behavior differs from mine, then.

When I quit and reopen the app, or choose one of my custom lists and then tap home, it switches to For You.

I have had the exact same discussion as we're having now many times since Twitter released the For You timeline. Never managed to pin-point to a specific behavior, everyone seems to get a different one.

Not surprised than Elon's Twitter's isn't better. In one hand I welcome their revert to tabs for "For you / Timeline", at least, it's easy to know you aren't reading the correct timeline…