Build generate files with old date - Oct 26, 1985

[ivansvlv]

Hi 👋

While investigating errors with storybook deployment to S3, I've noticed that building Storybook produced files with an odd old date - Oct 26, 1985. It's caused a problem when deploying static files to AWS S3 with aws s3 sync because these files are not getting update, thus not being deployed, leaving the old ones.

I'm using:
Node 16.3.0

"@storybook/addon-actions": "^6.3.0-beta.17",
"@storybook/addon-essentials": "^6.3.0-beta.17",
"@storybook/addon-links": "^6.3.0-beta.17",
"@storybook/builder-webpack5": "^6.3.0-beta.17",
"@storybook/manager-webpack5": "^6.3.0-beta.17",
"@storybook/react": "^6.3.0-beta.17",
"webpack": "^5.38.1"

Is this expected behaviour or it's a bug?