Full-disk install does not go past confirmation with an existing disk

[korewaChino]

When trying to reinstall on a disk with an already existing partition layout (e.g from a previous Readymade install), you cannot go past the confirmation page

How to reproduce

1. Prepare the disk by installing using Readymade normally (first try)
2. Start Readymade again, from a live image or from another install
3. In Readymade, select the disk from the previous install aforementioned
4. Select full disk install, then press next
5. Try to go to the next page after the confirmation prompt

[linear]

FYRA-399