net::ERR_INVALID_CHUNKED_ENCODING 200 (OK)

Good afternoon all,

I'm currently creating a brand new apache reverse proxy on apache 2.4.39 (the former one runs 2.2).
My config syntax is fine (double checked with -t), the proxy job is done by apache, the daemon is up and running, however I get "blank pages" displayed for some vhosts.

Troubleshooting actions :
Try to curl http(s)://theRemoteURL –> worked fine, so it's not due to ACLs
Checked apache's logs –> nothing related

When I display the web browser developper tools, I get this…

net::ERR_INVALID_CHUNKED_ENCODING 200 (OK)