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Because I moved cups logging into journal, 'View X log' in web ui now shows 'Not Found' because scheduler checks log settings before it serves the logs - and serves 'Not Found' when log is set to syslog.

After communication with upstream they removed the buttons in commit https://github.com/apple/cups/commit/0d94b8bf90aead5015e489a2bc6f41e10ca64c40

hello,
there is not button now but access is still open.
Like:
1,
/etc/cups/cups-files.conf:
AccessLog /var/log/cups/access_log

2, systemctl restart cups
3, cupsctl --remote-admin --remote-any --share-printers
4, open ff and go to https://10.0.137.8:631/admin/log/access_log

x: file is readable, log is there.

IS THIS EXPECTED with cups-2.2.6-27.el8.x86_64 ?

Yes, it is expected - the bug is only about removing buttons, which improves UIX (no 'Not Found' message when log is set to syslog, which is default, and user clicks on 'View X log'), not about accessibility of logs itself.
Ad accessibility - it should still behave the same way - 'Not found' when log is set set to syslog and accessible when the log is set to file. Buttons are removed for both cases.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:3617