If maximality already excludes the most physically relevant pathological spacetimes, the residual cases lacking hole freeness are physically unrealizable edge cases that do not threaten causal determinism in any robust sense.

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Causal determinism(Metaphysics / philosophy of causation): The theory that present and future events are determined causally by their antecedents, rooted in the principle that all events have a sufficient cause that determines them. It excludes uncaused events but permits logically possible alternatives that are merely incompatible with the actual causal chain.
Physically unrealizable(as used in philosophy of science): Something that cannot actually exist or happen in the real physical world, even though it might work perfectly in a mathematical equation.
hole freeness (or 'hole-free')(philosophy of physics and general relativity): A property where spacetime doesn't have 'holes' or gaps that would allow two different physical situations to be physically indistinguishable; basically, the requirement that physics is complete and unambiguous.
maximality(physics and philosophy of science)

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