There’s hope yet! We often see this as a result of jostling around in transport, sometimes a kit's journey to you is a little rough. While it’s still in the bag, we recommend gently pressing the block back together and allowing it some extra time to bounce back before cutting it open to start the fruiting process. It may take about a week to re-establish itself.
If your bag is already open, gently smoosh it together best you can and make sure to keep the block moist. We recommend using a humidity tent. Take a trash bag or other large loose bag and cut lots of ½” holes throughout - mushrooms need fresh air to form correctly! Drape the bag over your block and mist the inside of the bag every day. When you start to see baby mushrooms form (pinning), you can remove the bag and keep misting the block.