Content served from out domain is not compressed

Content served from out domain q3cdn.net is not compressed, neither by GZip nor Brotli.

Speed → Optimization → Content Optimization Brotli is switched on

We have purged the cache several times.

Examples are
https://q3cdn.net/2024.01.003/css/base.css
https://q3cdn.net/2024.01.003/js/base.js

The request headers Accept-Encoding contains gzip and br:

Content for this domain is served from a R2 bucket.

Content-Type looks good to me.

Can you possibly help? What am I missing?

I have already opened case #3101206, but after three days Cloudflare support asked me to reach out to the community.

The first case was closed without further notice. Reopening the case was not possible :frowning:

New: case #3110269.

Anybody?

Any ideas?

Switching to another provider.