Hi

With high retry[60] ndb transactions, I'm getting 2 contention exceptions 
(2 consecutive "TransactionFailedError(too much contention on these 
datastore entities..." logs), on the third retry, the get routine returns 
None instead of the entity, and the routine fails with an exception trying 
to access a property of None

Is this expected?

It's highly unexpected to me

As an additional info, it's an "XG" transaction, the "None" entity is the 
second entity that's fetched after an exception is logged for the first 
entity

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