"Encrypted by a device not verified by its owner" in message sent by device itself

### Steps to reproduce

When opening Element this morning after a while not using it (but never deinstalled!), in a conversation the app now shows a red shield icon with every single message sent from this same device. Clicking on the icon, a popup shows with under the "Trust" heading: "Encrypted by a device not verified by its owner". This is extra-weird because this never showed up before, and this account is only using the iOS client always on the same device, and it never showed this before.

On the Element-web client of the conversation partner, these red icons do not show.

### Outcome

#### What did you expect?

Not needing to verify the only device that this account is using.

#### What happened instead?

The red icons show up.

### Your phone model

iPhone 11

### Operating system version

iOS 16.4.1

### Application version

1.10.11

### Homeserver

Synapse 1.82.0+bullseye1

### Will you send logs?

No