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cmd/internal/fuzztest: TestScript/test_fuzz_deadline failures #76901

Description

@gopherbot
#!watchflakes
default <- pkg == "cmd/internal/fuzztest" && test == "TestScript/test_fuzz_deadline"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestScript/test_fuzz_deadline
=== PAUSE TestScript/test_fuzz_deadline
=== CONT  TestScript/test_fuzz_deadline
    run.go:226: 2025-12-13T16:05:32Z
    run.go:228: $WORK=/home/swarming/.swarming/w/ir/x/t/TestScripttest_fuzz_deadline3142268176/001
    run.go:235: 
        BOTO_CONFIG=/home/swarming/.swarming/w/ir/x/a/gsutil-bbagent/.boto
        CIPD_ARCHITECTURE=amd64
        CIPD_CACHE_DIR=/home/swarming/.swarming/w/ir/cache/cipd_cache
        CIPD_PROTOCOL=v2
...
        --- FAIL: FuzzDeadline (0.00s)
            --- FAIL: FuzzDeadline/seed#0 (0.00s)
                fuzz_deadline_test.go:14: function got true; want false
        FAIL
        exit status 1
        FAIL	fuzz	0.024s
        [exit status 1]
        > go test -run=FuzzDeadline -timeout=1s -wantdeadline=true
        [stdout]
        PASS
...
        fuzz: elapsed: 0s, gathering baseline coverage: 0/1 completed
        fuzz: elapsed: 0s, gathering baseline coverage: 1/1 completed, now fuzzing with 2 workers
        fuzz: elapsed: 1s, execs: 51815 (51016/sec), new interesting: 0 (total: 1)
        --- FAIL: FuzzDeadline (1.02s)
            context deadline exceeded
        FAIL
        exit status 1
        FAIL	fuzz	1.019s
    run.go:235: FAIL: testdata/script/test_fuzz_deadline.txt:22: go test -fuzz=FuzzDeadline -timeout=0 -fuzztime=1s -wantdeadline=false: exit status 1
--- FAIL: TestScript/test_fuzz_deadline (75.39s)

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