I have a website running on the main domain website.com on Netlify and the backend API server is running on the subdomain api.website.com. By enabling this plugin from netlify dashboard the latency of api.website.com was increased and sometimes it was unreachable (It's proxied via Cloudflare) and was giving 520/522 status error.
It's strange to me, after a couple of hours of debugging I just uninstalled the cache plugin and api.website.com recovered to normal function behavior.
api.website.com serves WebSocket and web APIs.