following room upgrades loses notification setting

### Steps to reproduce

1. Join a room such as !vlnjqGLpLJlFmBSkfQ:matrix.org
2. Customize notifications top this room, e.g. to pings only
3. Wait for the room to get upgraded
4. Click jump to new room !KDiNABdMiGixPIk0YCQ7syudVPr8hqpxpJl_qEUlxWQ
5. Join it
6. Check room notification settings

### Outcome

#### What did you expect?
The "same" room will have the same notification settings

#### What happened instead?
Default notifications on the new room

### Your phone model

_No response_

### Operating system version

_No response_

### Application version and app store

25.11.3

### Homeserver

_No response_

### Will you send logs?

No

### Are you willing to provide a PR?

No