Custom partitionioning "Decrypt" does not work

### What Happened?

When installing with custom partitioning, upon selecting a LUKS partition, a prompt will pop up, asking to decrypt the partition, but when "decrypt" is pressed, nothing seems to happen.

### Steps to Reproduce

1. Go into demo mode
2. partition disk as:
- 500 MB fat32 for efi
- XGB whatever
3. `cryptsetup luksFormat --type luks2 /dev/`
4. open the installer
5. When prompted for install type pick custom
6. click the luks partition to use it for something, enter password, and press decrypt

### Expected Behavior

I expected the drive to decrypt so that i could install root to it.

### OS Version

7.x (Horus)

### Software Version

Latest release (I have run all updates)

### Log Output

_No response_

### Hardware Info

_No response_