If there is no space to put the XP shards (and the factory is configured to generate them), then the factory stores the amount until there is space available.
This can cause a huge amount of XP shards to be dumped when there is space.
The only XP that is supposed to be stored is that left for 1 single shard
eg. killing 1 mob generates 1 xp, but 1 shard is 16 xp, so need to store until we have enough.

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