Why does the Simulink point-mass high-precission orbit propagator increase semi-major axis over time?

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I am using the "Orbit Propagator High precision" built-in Simulink block.
I have set the gravity model to point-mass, and the input and output frames as ICRF (as they were).
I do not select a specific solver. I fix a step-size, but let Simulink automatically select a solver.
When I run a simulation, and convert the X_icrf values to orbital elements, I see that the semi-major axis continually increases over time.
Shouldn't it remain constant for this setup?
Could you clarify why the "point-mass" model is outputing such behaviour?

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