EOF error during deploy in Github Action

Recently (just in the last few hours) we’ve been getting the following error during deploys from a Github Action:

Release v27 created

You can detach the terminal anytime without stopping the deployment
Monitoring Deployment

v27 is being deployed
428de088: sin pending
428de088: sin pending
428de088: sin pending
428de088: sin pending
428de088: sin running healthy [health checks: 1 total, 1 passing]
5e494cd4: cdg pending
5e494cd4: cdg pending
5e494cd4: cdg running healthy [health checks: 1 total, 1 passing]
Error 1 error occurred:
	* Post "https://api.fly.io/graphql": unexpected EOF

The deploy in fly.io succeeds but the Github Action is marked as fail due to the EOF error.