Element X not showing messages visible in Element Classic

### Steps to reproduce

I have both Element Classic and Element X installed. I sent a number of messages to a contact on the same instance using Element Classic. Some showed in X and some didn't.

STEPS TO REPRODUCE:
Not sure. All I did was send a number of messages and have some not sync. There's a chance that the ones that went through may have been on wifi, while the ones that didn't were definitely over cell data.

LOGS:
I can send them if needed, although getting them out right now is a bit of a time consuming PITA. If they're needed I'd also rather send them somewhere more private than Microsoft Copilot, *cough* I mean Github.

### Outcome

#### What did you expect?
Messages sent and received in either Element Classic or Element X are seen in both apps after a minute or so for syncing.

#### What happened instead?
2 of my messages showed in Classic, but 4 days later still didn't show in X, even after closing and reopening the app multiple times. I have drawn a red square in both screenshots around the 2 messages and where they should show in X.

Clearing the cache in Element X did get the missing messages to show, but obviously having messages not come through unless a user clears the cache is not correct functionality.

### Your phone model

Google Pixel 7 Pro

### Operating system version

GrapheneOS 2026050901

### Application version and app store

Element X 26.04.4 from FDroid and Element Classic 1.6.52 from FDroid

### Homeserver

Synapse 1.151.0~ynh1 (it's hosted on a Yunohost server, thus the ~ynh1)

### Will you send logs?

Yes

### Are you willing to provide a PR?

No