Timeline gap in room after using media gallery in it first, then scrolling up

### Steps to reproduce

1. Launch app (no room timeline in memory etc.)
2. Go to a room
3. Don't scroll up, go to gallery
4. Once some images appear, go back to room
5. Scroll up in room

### Outcome

#### What did you expect?
All messages to be always visible in timeline, no matter if media gallery is used before scrolling up in the room, or not.

#### What happened instead?
There's a gap in timeline, from `ElementX always opens room [...]` ([link](https://matrix.to/#/!aCvOWKNDeXXpPgquKq:matrix.org/$hksJeyN9NuDL9AW17kthvwse9QyZbdYEc6BGlnkQhNo?via=matrix.org&via=envs.net&via=tchncs.de)) to `I am slowly frustrated [...]` ([link](https://matrix.to/#/!aCvOWKNDeXXpPgquKq:matrix.org/$pbtiJqYiB8CQ80eV6fBvSh2JRrfqQFEn9avVlOcb_k0?via=matrix.org&via=envs.net&via=tchncs.de)), missing a day's worth of messages. This _might_ be the same spot in timeline to which the media gallery was able to load images from the room.

https://github.com/user-attachments/assets/9d712a04-9c00-4657-9997-f94df4fbed0f

Here's the same spot in the room after force stopping app and relaunching, then going into the same room and just scrolling up. `ElementX always opens room [...]` ([link](https://matrix.to/#/!aCvOWKNDeXXpPgquKq:matrix.org/$hksJeyN9NuDL9AW17kthvwse9QyZbdYEc6BGlnkQhNo?via=matrix.org&via=envs.net&via=tchncs.de)) is visible, and the message preceding it is `Thanks!` ([link](https://matrix.to/#/!aCvOWKNDeXXpPgquKq:matrix.org/$xGeM6EDH-7ZhNrT1T9WBMR4Di0Q3UVYDUAl7iuK_zGU?via=matrix.org&via=envs.net&via=tchncs.de)), as expected.


### Your phone model

Google Pixel 7 Pro

### Operating system version

Android 15

### Application version and app store

Element X v0.7.6 from GH releases

### Homeserver

Synapse v1.121.1

### Will you send logs?

Yes

### Are you willing to provide a PR?

No