Beacon beams are not loaded from save if player is not within ~50 blocks of the Beacon

Minecraft seems to save the `Levels` tag for the Beacon BlockEntity as 0 instead of the actual value when there are no players within range of the beacon (or maybe when the beacon leaves simulation distance of the server?). Chunky checks that this tag is >0 to determine whether to generate a beam entity for the beacon.

Workarounds for the user include loading the chunks multiple times while moving the player in range of each beacon in the scene, or manually adding BeaconBeam entities through the Entities tab.

A possible solution for Chunky could be to check for at least one layer of valid blocks below the beacon block.

Related discussion in Discord: https://discord.com/channels/541221265512464394/1235105317759746130