firebase-tools: Grouped functions deployment fails with errorType: OK

[REQUIRED] Environment info

firebase-tools: 11.10.0

Platform: macOS

[REQUIRED] Test case

N/A, see next section.

[REQUIRED] Steps to reproduce

1. Create a set of two or more grouped functions, as per Firebase documentation.
2. Issue firebase deploy --only functions:myNewAndShinyGroupedFunctions
3. Grab a cup of coffee while you wait for the deployment to fail

Running this from a yarn workspace (monorepo), which is most likely the source for the warning in the error message.

[REQUIRED] Expected behavior

Deployment of grouped functions should work, as it did yesterday (problem noticed first time today, some 4 or so hours ago). The error message should explain what went wrong.

[REQUIRED] Actual behavior

When deploying any grouped functions, or occasionally when deploying a single function within a group, I get the following error:

Build failed: {"metrics":{},"error":{"buildpackId":"","buildpackVersion":"","errorType":"OK","canonicalCode":"OK","errorId":"","errorMessage":""},"stats":[{"buildpackId":"google.nodejs.runtime","buildpackVersion":"1.0.0","totalDurationMs":1038,"userDurationMs":0},{"buildpackId":"google.utils.archive-source","buildpackVersion":"0.0.1","totalDurationMs":85,"userDurationMs":85},{"buildpackId":"google.nodejs.npm","buildpackVersion":"1.0.0","totalDurationMs":19965,"userDurationMs":19663},{"buildpackId":"google.nodejs.functions-framework","buildpackVersion":"0.9.4","totalDurationMs":5331,"userDurationMs":4999},{"buildpackId":"google.config.entrypoint","buildpackVersion":"0.9.0","totalDurationMs":0,"userDurationMs":0},{"buildpackId":"google.utils.label","buildpackVersion":"0.0.2","totalDurationMs":0,"userDurationMs":0}],"warnings":["*** Improve build performance by generating and committing package-lock.json."],"customImage":false}

This error is repeated for each failed function deployment in the group. Grouped function deployments seem to almost always fail as a whole (1-2 functions in the group may in some rare cases deploy successfully), single function deployments succeed about 50% of the time.