Both the same round(!) Spotlight. Scene with cube on level.
This is no longer a round spot!!! How am I supposed to work with something like that! 
Then I did the same thing again in Cinema with the result I was expecting.
Very, very bad!
This is fixed in the latest Service Release Candidate 8.14. See RH-84852 Rendering Cycles: Spotlight casts an elongated stripe over the entire scene
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