Flaky test: //score/mw/com/gateway/transport_layer/sample:bidirectional_transport_test

## Flaky test: `//score/mw/com/gateway/transport_layer/sample:bidirectional_transport_test`

**Cumulative failed runs observed:** 13 (over 3000 total runs, 9 nightlies)
**First seen:** 2026-08-14 · **Last seen:** 2026-09-13

### Per-config cumulative

| Config | Failed | Total |
|--------|-------:|------:|
| asan-ubsan-lsan | 6 | 1500 |
| gcc15-unit | 7 | 1500 |

```json
{
"configs": {
"asan-ubsan-lsan": {
"failed_runs": 6,
"total_runs": 1500
},
"gcc15-unit": {
"failed_runs": 7,
"total_runs": 1500
}
},
"cumulative_failed_runs": 13,
"cumulative_total_runs": 3000,
"first_seen": "2026-08-14",
"last_seen": "2026-09-13",
"nightly_count": 9,
"target": "//score/mw/com/gateway/transport_layer/sample:bidirectional_transport_test"
}
```

Start by running //score/mw/com/gateway/transport_layer/sample:bidirectional_transport_test in the asan-ubsan-lsan and gcc15-unit configurations, then inspect the failures and the surrounding transport-layer test code. Done means identifying and fixing the intermittent failure so repeated runs no longer reproduce it across the affected configurations.

Written by the indexing model from the issue text.