On load, some rooms with no unread events are marked bold

**Describe the bug**
When loading, some rooms are **bold**, which indicates that they have unread events/messages. This is not the case for many of these rooms. When I click on the rooms they are unbolded (presumably marked read.)

**To Reproduce**
Load Hydrogen after a long break of using other clients.

**Expected behavior**
Rooms with no new events, even if they have not been marked read by Hydrogen, should not be bold. Not sure how Hydrogen should glean this information?

**Desktop (please complete the following information):**
- OS: Mac
- Browser Firefox
- Version 84
Hydrogen version: 0.1.30 (1279723413)