After creating a structure using a structure block in experimental edition with a name LuckyEntity:witherSkeleton, it loads fine and works untill the realm crashes, or restarts. Once it does restart the structure no longer loads and I would have to recreate it.
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Thank you for your report!
We're actually already tracking this issue under MCPE-12347 so I've requested this report be resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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When it crashes it resets the entire realm at a certain point, not part of it.