Spoiler text is shown unredacted in post preview

### Bug Description

![Image](https://github.com/user-attachments/assets/98f1611b-9612-4142-ae11-eacc6e4bb752)

### Expected Behaviour

Post preview should not display spoilered text

### Steps to Reproduce

. 

### Additional Context

_No response_

### App Version

_No response_

### Device

Pixel 9a

### OS

Grapheneos 