App always opens in home view after being on background for a while, forgets most recent chat

**Describe the bug**
Having the iOS app be inactive (i.e. on background) for more than a couple minutes results in reverting to the home screen, rather than staying in the most recently used chat. This doesn't seem to be expected behavior, so flagging this as a bug.

**To Reproduce**
Steps to reproduce the behavior:
1. Open app
2. Navigate into a chat
3. Return to iOS home screen (app overview) and wait 5 minutes or longer
4. Open Element app again and look at home screen (i.e. the chat and room overview) instead of immediately seeing the most recent chat.

**Expected behavior**
The app should always open the most recent chat.

**Desktop (please complete the following information):**
- OS: [e.g. iOS]
- Browser [e.g. chrome, safari]
- Version [e.g. 22]

**Smartphone (please complete the following information):**
- Device: iPhoneSE
- OS: iOS 14.4.2
- Element 1.2.7

**Additional context**
For some reason, sometimes it seems to retain the past state and stay in the recent chat. Most of the time it doesn't.