Workers error while executing bazel clean

The following message seems to be showing when bazel clean is done

```
INFO: Error while reading response from multiplexer process for DatabindingWorker: java.io.IOException: Could not parse json work request correctly
```

Start by reproducing the issue with bazel clean and inspect the DatabindingWorker multiplexer output around the JSON work request. Trace where the response is read and parsed, then verify that bazel clean completes without the parsing error.

Written by the indexing model from the issue text.