I don't understand. We don't have real time revocation for passports, do we?

In fact, we don't have real time revocation of any document until very recently...

We do. There are centralized databases of passport serial number, for blacklisting (revocation) or just persons of interest.

For all countries? I was always wondering about that when doing one of these wonderful "take a selfie of you holding your passport" "authentication" procedures...

don't we? We call somewhere and revoke the Passport, atleast in Germany.

But does that propagate to every entity worldwide using passports for identification, including all non-government-affiliated companies and KYC providers?

That's very true for a lot of PKI systems too. The revocation lists are published, but nobody is reading them.

At least they exist. I've tried looking into this in the past, and I haven't really found any public passport revocation list, even of just numbers (i.e. without disclosing associated names or any other sensitive data).