Does anyone have experience enabling ECH in browsers, but not using the built-in DoH?

I have DoH or DoT resolvers on openwrt for all devices. I don’t like browsers having seperate server. But ECH seems hit or miss on desktop and Android, when using the system server. Either Firefox or Chromium flavours. Is it just me?

https://defo.ie/ech-check.php always shows GREASE.