Ok I manage to fix this by myself.. turns out that the json key for the «slices» object was changed from «body» to «slices» and this was causing the slice data not apply to content type slices pages.
@Pau do you have an idea what cause this and how I can prevent this to happen again ? I would like to migrate slice-machine v1.5.1 but I am afraid that this could happen again.
Its difficult to pinpoint the exact cause. The best option is always to keep Slice Machine's version up to date. This ensures that you benefit from any bug fixes and enhancements that have been released.
Overall, also staying engaged with the Prismic community are good practices to help prevent and mitigate potential issues.