This improves error reporting if loading mappings for the immutable ID tracker fails. While this doesn't resolve the load issue, it helps us pinpoint to the place of failure much quicker.

Before, our error looked like this:

IO error: failed to fill whole buffer

Now it looks like this:

Inconsistent storage: Immutable ID tracker failed to read next mapping, reading entry 46001/46077, assuming malformed storage: Inconsistent storage: failed to read numeric point ID from file: failed to fill whole buffer

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