The recipe unlock is attached to the construction robotics technology, I can see two ways this can break.
1. The technology is not available. I am not sure how to deal with this as it is mod dependent and I do not want to add explicit compatibility with unrelated mods. I will add unlocking the recipe at the start of the game as a fallback, so it at least won't get stuck.
2. The mod was added to an existing save when the technology was already researched. This is currently not handled, i might add it to a future version.
For now, if you have access to commands, execute 'game.player.force.recipes["alert-scanner"].enabled = true'. That should unlock the recipe for that save.
