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The 4.0 transaction spec says:
startTransaction SHOULD report an error if the driver can detect that transactions are not supported by the deployment. A deployment does not support transactions when the deployment does not support sessions, or maxWireVersion < 7, or the topology type is Sharded
https://github.com/mongodb/specifications/blob/cf7248b2574b1a5397a6e18362acfe66f2b55a43/source/transactions/transactions.rst#starttransaction
Please verify whether your MongoDB 4.0-supporting driver release raises a client side error in this case.
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