Problems is such a strong word, more just deliberate weirdness 
- we’ll just disable this new feature if you are now confident that it is known not to play well with Cloudflare. We don’t use Brotli or Rocket Loader.
We use Cloudflare as a way of wildcarding over S3/Cloudfront, and page rules for redirecting over HTTPS, so this is deliberate for us and saves us some self hosting costs - S3 upload bucket, cdn url and bucket name in CNAME - #7 by fearlessfrog