Engine built for arm64 is not picked up by --local-engine. Passing host_debug_unopt_arm64 still redirects it to host_debug_unopt, which is not the correct directory.

Offending lines in the tool seem to be:

This makes the dev cycle on M1 laptops awkward. You have to use Rosetta (i.e. prepend arch -x86_64 to commands), which is not documented in our wikis (and unlikely to be documented, since this is a bug, not a feature).