Multiple wedged olm sessions from different users -- possible storage corruption?

### Steps to reproduce

This came from a rageshake. The symptom is that the user got UTDs from multiple users. The rageshake show that the client failed to decrypt the to-device messages containing the Megolm sessions. The Olm messages were non-pre-key messages, so there was no issue with OTKs.

The only cause that I can think of is that the storage was corrupted somehow, changing several Olm sessions.

### Outcome

#### What did you expect?

#### What happened instead?

### Operating system

Linux

### Browser information

Firefox 137.0

### URL for webapp

app.element.io

### Application version

1.11.99, Rust SDK 0.10.0 (3cc301d), Vodozemac 0.9.0

### Homeserver

Synapse 1.128.0

### Will you send logs?

Yes