The computation of causal graph heuristic cache misses is currently buggy (https://github.com/aibasel/downward/pull/253).
It would be easy to fix, but is also the case that the cache hits and misses are not currently used for anything. Way back, when we didn't have the current plug-in architecture, they were part of the planner output, but they haven't been for a long time, and nobody seems to have missed them. So rather than fixing the computation of these cache statistics, we're removing them instead.
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