After uploading 2.2.9 to Debian unstable, the CI runner (which run a test on an installed CUPS instance) started to fail: https://ci.debian.net/packages/c/cups/testing/amd64/

Specifically: https://ci.debian.net/data/autopkgtest/testing/amd64/c/cups/1329969/log.gz

The following command is launched:

lpadmin -p test-printer0 -E -m raw -v file:///dev/null

It spits "incorrect request" and the printer is not created, but reading from the logs didn't allow me to understand why.

This only started to fail in 2.2.9; and running lpadmin without the -E then cupsenable seems to work.

What has changed?