You should invalidate the LazyOptionals in TileEntities

[Iuhegi]

In your tile entity classes with LazyOptional<?> fields, you should be overriding the invalidate method in the tile, and calling lazyOptional.invalidate(); on them.

[Iuhegi]

By doing this you ensure that any other blocks that store a reference to the LazyOptional instance release their cached value resulting in no references to it, which will allow for proper garbage collection.