Some cubes aren't properly marked as ticking

[CursedFlames]

Not clear what's causing this. Encountered this while testing lightning for #78: when a lightning rod is placed in some cubes, those cubes return false on the ticking check, which causes lightning to fail.

(This is specifically referring to PersistentEntitySectionManager.isPositionTicking(BlockPos))

[NotStirred]

We were previously only ticking ENTITY_TICKING cubes, we now properly tick TICKING cubes. Need to test if this issue is fixed as of 00aed9d