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Handle multiple deserialization of a block's entities
This fix consists of two parts: - Clear the list of stored entities. This has no side-effects. - Catch the case where active entities exist and print a message. Clearing the active entitiy list has side-effects that should be handled. (those entities are known to the environment and to clients). As avoiding those side-effects is more complex, and as this problem is not expected to occur (with PR #4847 merged), there is no real incentive to implement this ATM. This issue was a contributing factor to bug #4217. With the other contributing factor removed (PR #4847), this commit makes sure this factor does not go unnoticed if it ever happens again.
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