functions-framework-nodejs: nodejs10 runtime doesn't work with .yarnrc yarn-path

I have no idea where I can write bugs for newer nodejs10 runtime

At nodejs8 runtime we used yarn feature yarn-path in .yarnrc it allows us to use more modern yarn vs google runtime has. (see https://yarnpkg.com/lang/en/docs/yarnrc/)

But with nodejs10 runtime this feature doesn’t work, on deployment we have error like

Cannot find module '/workspace/bin/yarn-1.13.0/yarn.js'

I created a sample project to reproduce https://github.com/istarkov/nodejs10-runtime-error

if you run there

# uses nodejs8 runtime
yarn deploy:8

project will be deployed, result at https://europe-west1-realadvisor-v1-sites.cloudfunctions.net/test-env will show that used yarn version was 1.13.0

But if you run

# uses nodejs10 runtime
yarn deploy

the result will be

(gcloud.beta.functions.deploy) OperationError: code=3, message=Build failed: {"error": {"canonicalCode": "INVALID_ARGUMENT", "errorMessage": "`npm_install` had stderr output:\ninternal/modules/cjs/loader.js:584\n    throw err;\n    ^\n\nError: Cannot find module '/workspace/bin/yarn-1.13.0/yarn.js'\n    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:582:15)\n    at Function.Module._load (internal/modules/cjs/loader.js:508:25)\n    at Function.Module.runMain (internal/modules/cjs/loader.js:754:12)\n    at startup (internal/bootstrap/node.js:283:19)\n    at bootstrapNodeJSCore (internal/bootstrap/node.js:622:3)\nnpm ERR! code ELIFECYCLE\nnpm ERR! errno 1\nnpm ERR! test-env@1.0.0 postinstall: `yarn --version > ./version.txt`\nnpm ERR! Exit status 1\nnpm ERR! \nnpm ERR! Failed at the test-env@1.0.0 postinstall script.\nnpm ERR! This is probably not a problem with npm. There is likely additional logging output above.\nnpm WARN Local package.json exists, but node_modules missing, did you mean to install?\n\nnpm ERR! A complete log of this run can be found in:\nnpm ERR!     /builder/home/.npm/_logs/2019-04-16T17_52_23_870Z-debug.log\nnpm ERR! code ELIFECYCLE\nnpm ERR! errno 1\nnpm ERR! @ preinstall: `npm --prefix functions install`\nnpm ERR! Exit status 1\nnpm ERR! \nnpm ERR! Failed at the @ preinstall script.\nnpm ERR! This is probably not a problem with npm. There is likely additional logging output above.\n\nnpm ERR! A complete log of this run can be found in:\nnpm ERR!     /builder/home/.npm/_logs/2019-04-16T17_52_23_911Z-debug.log\n\nerror: `npm_install` returned code: 1", "errorType": "InternalError", "errorId": "8C17AC34"}}
error Command failed with exit code 1.

Please help, at least give me a direction where I can report gcloud issues and bugs, as its not the only issue I know.