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ComputeSysRouteTable built one IPSet from every advertised prefix, which coalesced adjacent prefixes (10.0.0.2/32 and 10.0.0.3/32 became 10.0.0.2/31). Windows treats the last address of an on-link prefix as broadcast, so the merged route made that address unreachable. Apply the excludes to each advertised prefix on its own and only drop exact duplicates left by overlapping prefixes.
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ComputeSysRouteTable built one IPSet from every advertised prefix, which coalesced adjacent prefixes (10.0.0.2/32 and 10.0.0.3/32 became 10.0.0.2/31). Windows treats the last address of an on-link prefix as broadcast, so the merged route made that address unreachable.
Apply the excludes to each advertised prefix on its own and only drop exact duplicates left by overlapping prefixes.