Thanks for explaining! That’s quite different from the US English (and RFC English) meaning of “should”.
https://polish2english.files.wordpress.com/2011/11/55551980-...
I'm afraid I don't know what RFC English is and neither does Google.
SHOULD This word, or the adjective "RECOMMENDED", mean that there
may exist valid reasons in particular circumstances to ignore a
particular item, but the full implications must be understood and
carefully weighed before choosing a different course.
It means you can’t simply ignore it, and instead have to have compelling reasons to justify any deviation.