Stopped reason ResourceInitializationError: failed to download env files: file download command: non empty error stream: RequestCanceled: request context canceled caused by: context deadline exceeded

Error: Stopped reason ResourceInitializationError: failed to download env files: file download command: non empty error stream: RequestCanceled: request context canceled caused by: context deadline exceeded

Using: CloudFormation, ECS Fargate

For some reason, the public subnets where the ECS Fargate instances were deployed lost the explicit association to a route table that I also had in the same CloufFormation template. I had to comment the related AWS::EC2::SubnetRouteTableAssociation's, update the stack, uncomment them and update the stack again.