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Docker records an environment variable that is declared without a value as a bare name, which DockerEnv maps to a null value rather than omitting the key. Map.getOrDefault only falls back when the key is absent, so both the fallback key and the guest default were skipped. See gh-51546 Signed-off-by: JaeHyunAn <98042706+yyuneu@users.noreply.github.com>