Messages are not listed unless searched for

About a week ago i started using Evolution on a new machine. I tried to move my account settings, then reconfigured my mail accounts.

At first all looked fine, but then i noticed i couldn't find a recent message that was shown in the web interface on the server. It turned out, however, that i can find the "missing" message if i search for it with the search box.

So, here are the symptoms.

1. Messages more recent than about a week ago do not show up in any of the ordinary folders. This concerns both received and sent messages and all kinds of ordinary folders (inboxes and the other).

2. All messages show up once i search for them with the search box. In particular, searching for a single space "character" lists all messages, because all messages contain spaces.

3. Search folders work normally and list all messages, including those that are not listed in the ordinary folders.

This is Evolution 3.36.5-0ubuntu1 on Linux Mint 20.3.