Skyblock Spawning

I'm trying to create a skyblock mod; so I created a Skyblock Dimension and Biome, both being made up of souly air blocks. Then I have a procedure that:

1. Checks if "Global: playerjoin" = "false"
2. If true (Global: playerjoin = false) then switch dimension of "entity/target entity" to "Skyblock"
3. Place 9 Grass blocks (Grass at 0, 80, 0 | 1, 80, 0 | etc in a 3x1x3)
4. Repeat for Dirt, same way
5. Repeat for Bedrock, same way
6. Set logic "Global: playerjoin" to "true"
7. While "Get block x, y-1, z" is "Air" | Set location of "Event/Target Entity" to "0, 81, 0" | Set "Event/Target Entity" spawn to "0, 81, 0"
    

Issue is, it doens't work. I create a new world, and it does auto load me into the Skyblock Dimension.

However, I simply plumit into the void, die, and then spawn back in the overworld