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The vcpkg binary cache was restored on every Windows run, but vcpkg rejected all binaries and rebuilt from source. vcpkg keys each binary by an ABI hash that includes the MSVC toolset version, which was not part of the cache key (only OS, compiler name, vcpkg submodule SHA and the vcpkg-configuration.json hash). When the runner image bumps MSVC, the restored binaries become ABI-incompatible and vcpkg rebuilds everything. Because the cache key stays unchanged, the action skips saving the freshly built binaries, so the stale entry can never refresh and the rebuild loop persists across runs. Add the MSVC toolset version (VCToolsVersion, exported by the MSVC setup step) to the cache key on Windows. A toolset bump now yields a new key, producing one cold rebuild followed by a successful save under the new key, after which subsequent runs restore from cache.