MSO RC4 encryption is still supported in 5.3?

Libre Office used to open RC4 encrypted Power Point presentation, but version 5.3.7 say “Opening of password encrypted Power Point document is not supported” when opening the same .pps LO used to open with version
The contemporary Microsoft Office default Binary Document encryption “RC4 CryptoAPI Encryption” is now supported (Caolán McNamara, Red Hat, Inc.)

Without a sample file, it’s hard to tell. Within an X.Y release, features don’t get removed usually. Please provide a sample, maybe directly to bug tracker.

On LibreOffice is not showing the error Window “Opening of password protected Power Point document is not supported”, but just silently exits/crashes when opening MSO RC4 encrypted pps file.

Mike Here you have the bug report with test files: